…kages/image_picker/image_picker_android/android (#6648)

Bumps androidx.core:core from 1.10.1 to 1.13.1.

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Configures the flutter/packages CI to run web tests using the `canvaskit` renderer, which is the new default for web apps.

It also does some minor changes:

* Skips tests on the web for `package:palette_generator` (cleanup issue created below)
  * Makes the `palette_generator` example run on the web. This was used to manually verify that the package still works as expected with canvaskit.
* Tweaks the README of the `pointer_interceptor` example apps, so they match what's happening in there.

## Issues

* Fixes flutter/flutter#143543

Co-authored-by: David Iglesias <[email protected]>

fixes flutter/flutter#132824

…to MainActor annotation (#7100)

iOS 18 Beta 3 added `@MainActor @Sendable` for openURL's completion handler: 

```
    @available(iOS 10.0, *)
    open func open(_ url: URL, options: [UIApplication.OpenExternalURLOptionsKey : Any] = [:], completionHandler completion: (@mainactor @sendable (Bool) -> Void)? = nil)
```

The addition of `@MainActor` is the one that caused the compile error. It was not there for Beta 1. 

This PR we simply use a `DefaultLauncher` wrapper. As expected, passing in a **non-isolated closure** to a function that expects a **main-actor isolated closure** is fine, since non-isolated closure can be called in any isolation context; plus the minimal concurrency checking also silences the Sendable warning.
 
But we should check again in newer betas if we can revert this change. Because this compile error forces some libraries to update for swift concurrency, which seems to be against the whole idea of having 3 different levels of concurrency checking. So I suspect that Apple is still hashing things out and may change it back (either by removing `@MainActor` from signature, or compiler change to allow this conformance under minimal checking) 

*List which issues are fixed by this PR. You must list at least one issue.*
Fixes flutter/flutter#151467

This PR introduces a new `android_build_all_packages_legacy` in `master`
and `stable` to build only the "legacy" version of an Android project
using JDK11.

This PR is required to resume rolling the flutter framework, like here:

* #7099

The C++ generator wasn't adjusting enum value names, so they were just using the Dart camelCase style. This makes them style-guide compliant by adding the `k` prefix and making the first actual letter upper-case.

Fixes flutter/flutter#147328