25612 Add Metal to the FlutterCompositor struct in the Embedder API (cla: yes, embedder)

25690 Revert TaskRunner changes to fix Fuchsia Test failures (platform-ios, cla: yes, platform-fuchsia, embedder)

25692 Reland “TaskSources register tasks with MessageLoopTaskQueues dispatcher” (cla: yes, waiting for tree to go green, embedder)

25824 add flag to identify sub-trees with PlatformViewLayers and always paint them (cla: yes, embedder)

25843 [flutter_releases] Flutter Stable 2.0.6 Engine Cherrypicks (platform-ios, platform-android, cla: yes, platform-web, platform-macos, platform-linux, platform-windows, platform-fuchsia, embedder)