…neric unicode icon (#169092)

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#168846

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

This cherry pick fixes an issue where some users would see a question mark instead of the appropriate icon in the widget inspector button which toggles select-mode on/off.

### Impact Description:
Users who don't have `cupertino_icons` as a dependency in their pubspec will see a question mark in one of the widget inspector buttons. 
<img width="169" alt="Screenshot 2025-05-19 at 12 50 15 PM" src="https://github.com/user-attachments/assets/40cd01c9-f8a6-407d-9d1b-303bc1516d62" />

### Workaround:
Is there a workaround for this issue?

Yes, add `cupertino_icons` package to user's pubspec.

### Risk:
What is the risk level of this cherry-pick?

Low

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

This was tested manually, there are no screenshot tests for this. However, this is only a UI change and not a behavior change.

### Validation Steps:
What are the steps to validate that this fix works?

1. Run an app that doesn't have `cupertino_icons` in its pubspec
2. Open Flutter DevTools > Inspector
3. Enable select widget mode
4. Should not see a ? on any of the buttons

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

There was no associated issue, but the problem is that #166727 broke Flutter Android builds on apps that use plugins with AGP versions less than 8.2.

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Fixes Flutter Android builds for apps which use plugins with old Android Gradle Plugin versions.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

The impact is a crash in the build process.

### Workaround:
Is there a workaround for this issue?

No

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

Build an app that uses AGP < 8.2.

…169380)

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#169101

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Reduces the cost of running the (sometimes flaky) `Linux fuchsia_test` on release branches.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

N/A - CI infra optimization.

### Workaround:
Is there a workaround for this issue?

N/A - CI infra optimization

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

N/A - CI infra optimization

…169484)

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#169319

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Fixed a bug where the `flutter` tool crash reporting did not include what plugins were being used by the current project.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

Tool crash reports are missing plugins in use.

### Workaround:
Is there a workaround for this issue?

Yes, `flutter config --no-explicit-package-dependencies`, but that has other project impact, or copying and pasting the plugins manually.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

See unit tests.

Fixes #156793

### Issue Link:

#156793

### Changelog Description:

Fix flaky crash when targeting web applications via IDEs using the DAP.

### Impact Description:

The `flutter debug-adapter` process started by IDEs can crash when requesting isolate information from a Flutter web application that has disposed its isolate (i.e., at shutdown or due to a hot restart).

This is the top crasher for `flutter_tools`, accounting for ~66% of all crashes for 3.32.0.

### Workaround:
Is there a workaround for this issue?

No.

### Risk:

This CP is low risk as only additional exception handling was added to the DAP logic in `package:dds` (see https://dart-review.googlesource.com/c/sdk/+/431060) to handle the specific case outlined in the issue.

### Test Coverage:

This issue is difficult to reproduce without injecting test-only code via custom VM service RPCs across multiple repositories. Testing was done manually with this approach, but the testing code is not committed.

### Validation Steps:

IDE extensions don't crash when interacting with Flutter Web applications during hot restart / application shutdown.

That branch includes a cherry pick of a fix for #168849

…mantics node (#169362)

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#169175

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Fixed unexpected crash when using Tab and TabBar widgets. 

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

app crash

### Workaround:
Is there a workaround for this issue?

Wrap the Tab widget with a MergeSemantics widget will mitigate the issue.

### Risk:
What is the risk level of this cherry-pick?

  - [O] Low

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

  - [O] Yes

### Validation Steps:
What are the steps to validate that this fix works?

create a TabBar that has a Tab with image widget
```dart
TabBar(
  tabs: <Widget>[
      Tab(icon: Image.network('https://some-url')),
      Tab(icon: Icon(Icons.beach_access_sharp)),
      Tab(icon: Icon(Icons.brightness_5_sharp)),
  ],
),
```

This updated the dart revision for the upcoming flutter stable release, 3.32.1

#169675)

```sh
git log -1 --pretty=format:%H -- "$(git rev-parse --show-toplevel)/DEPS" "$(git rev-parse --show-toplevel)/engine"
```

…169623)

This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request)
Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request.

### Issue Link:
What is the link to the issue this cherry-pick is addressing?

#169602

### Changelog Description:
Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples

Fixes a bug where `appFlavor` is `null` when being run with `flutter test` or being hot-restarted.

### Impact Description:
What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch)

Cannot reliably use `appFlavor` without rebuilding the app from scratch.

### Workaround:
Is there a workaround for this issue?

Do not use hot restart, do not use `flutter test`.

### Risk:
What is the risk level of this cherry-pick?

### Test Coverage:
Are you confident that your fix is well-tested by automated tests?

### Validation Steps:
What are the steps to validate that this fix works?

Automated test coverage.

#169619)

Update engine.version and changelog for upcoming stable release 3.32.1