…hen objects call to Dart after a hot restart (#10571)

Fixes flutter/flutter#176451

## Pre-Review Checklist

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Redistribute package ownership among Android team.

## Pre-Review Checklist

# [rfw] Add Flexible widget support

This PR adds support for the `Flexible` widget to Remote Flutter Widgets (RFW), allowing developers to create flexible layouts with both loose and tight fitting behavior.

Fixes [#173313](flutter/flutter#173313)

The `Flexible` widget provides more granular control over flex layouts compared to the existing `Expanded` widget:
- **FlexFit.loose**: Widget takes only the space it needs (default)
- **FlexFit.tight**: Widget takes all available space (same as Expanded)

**Implementation:**
- Added `Flexible` widget to `lib/src/flutter/core_widgets.dart`
- Supports `flex` (default: 1) and `fit` parameters (loose/tight, default: loose)
- Uses existing `ArgumentDecoders.enumValue` pattern for FlexFit parsing
- Maintains alphabetical ordering and follows existing RFW patterns
- Added comprehensive test coverage in `test/core_widgets_test.dart`
- Refactored tests based on code review feedback to reduce duplication

**Usage Example:**
```rfwtxt
import core.widgets;

widget FlexibleDemo = Column(
  children: [
    Flexible(
      flex: 1,
      fit: "loose",
      child: Text(text: "Takes needed space"),
    ),
    Flexible(
      flex: 2,
      fit: "tight", 
      child: Text(text: "Takes all available space"),
    ),
  ],
);
```

**API Compatibility:**
Follows Flutter's `Flexible` widget API exactly:
- `flex: int` (default: 1)
- `fit: FlexFit` (loose/tight, default: loose)  
- `child: Widget` (required)

## Pre-Review Checklist

Every custom github action needs to be added to the allowed list. Since the branch exists is simple enough to rewrite, i removed the external dependencies instead of adding it to the allowed list.

## Pre-Review Checklist

**Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.

[^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.