54467 [flutter_tools] update compilation to use package config (a: null-safety, cla: yes, tool)

54478 Fix environment leakage in doctor_test (cla: yes, team, team: flakes, team: infra, tool)

54488 Remove Finder extended attributes from iOS project files (cla: yes, platform-ios, tool)

54555 [flutter_tools] refactor FlutterManifest to be context-free (cla: yes, tool, waiting for tree to go green)

54613 [flutter_tools] support enable-experiment in flutter analyze (a: null-safety, cla: yes, tool, waiting for tree to go green)

54617 [flutter_tools] initial support for enable experiment, run, apk, ios, macos (a: null-safety, cla: yes, team, tool)