Clean up leaks in FF in non-blocking mode and release leak tracker.

[polina-c]

• [x] Host discussion on Dash forum: http://flutter.dev/go/leak-tracker-high-level-design
• [x] Clean up tech dept converting ‘testWidgetsWithLeakTracking’ to ‘testWidgets.experimentalLeakTesting’: https://github.com/flutter/flutter/pull/138057
• [x] Find cases for real issues with real applications
• [x] https://github.com/flutter/flutter/issues/140414
• [ ] Finalize cleanup for notDisposed in FF: https://github.com/flutter/flutter/issues/134787
• [ ] Find how much effort will it take to keep FF leak free by @polina-c owning fixes for all regressions detected by the non-blocking bot for X months.
• [x] Rename MemoryAllocations https://github.com/flutter/flutter/issues/140622
• [x] Chat with Remi and other package authors to understand their interest in enabling leak tracking for their packages
• [ ] Make bots blocking
• [ ] Host follow up discussion
• [ ] Release leak tracker?

feedback discord chat