[stable] fix(tool): parse ADB device lists by connection state - #191296

Fixes flutter#189972

Related to flutter#189430 and flutter#189369. This supersedes the narrower parser
approach from closed PR flutter#189431.

## Summary

ADB formats long device-list rows as [`%-22s
%s`](https://android.googlesource.com/platform/packages/modules/adb/+/1cf2f017d312f73b3dc53bda85ef2610e35a80e9/transport.cpp#1410):
the serial field has a minimum width, so a long wireless serial can be
separated from its connection state by a single space. mDNS conflict
suffixes can also introduce whitespace inside the serial.

[PR flutter#189369](flutter#189369) correctly
protects serials containing whitespace by requiring two spaces or a tab
before the state. [PR
flutter#189431](flutter#189431) proposed a
narrower one-space fallback for serials without whitespace and was
closed after flutter#189369 landed. The combined case has both an mDNS conflict
suffix and a valid single-space state delimiter, so neither earlier rule
accepts it.

This change parses the explicit known ADB connection-state field instead
of inferring a boundary from whitespace width. The serial capture is
greedy so state-like words and mDNS conflict suffixes remain part of the
serial, and right-side padding from ADB's minimum-width field is
removed.

## Tests

Added regression coverage for:

- ordinary single-space wireless mDNS serials;
- mDNS conflict serials containing ` (2)` with `device` and `offline`
states;
- every state currently recognized by Flutter Tools;
- serials that contain state-like words; and
- existing padded and tab-separated output forms.

Ran:

```text
flutter test packages/flutter_tools/test/general.shard/android/android_device_discovery_test.dart
flutter analyze packages/flutter_tools
```

The device-discovery test file passed with 16 tests, and analysis
reported no issues.

## Real-device validation

After deleting `bin/cache/flutter_tools.snapshot`, unmodified
`upstream/master` at `0ed149e63db1f68d2042063baf0a99d969ccd84b` omitted
the wireless Android device and reported an unexpected ADB parsing
failure. With this patch, `flutter devices -v` listed the device with
the complete mDNS conflict serial and successfully used that serial for
`adb -s ... shell getprop`.

## Scope

This PR changes only Flutter Tools parsing and its Android
device-discovery tests. It does not change ADB, mDNS pairing, wireless
transport behavior, or device-state handling after a row has been
parsed.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [AI contribution guidelines] and understand my
responsibilities, or I am not using AI tools.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.