https://flutter.dev/go/clean-up-not-disposed-disposables-in-ff

Bigger issue: flutter/devtools#6909

• Update leak_tracker:
  • Define adjustable settings: Create adjustable test settings. dart-lang/leak_tracker#152
  • Remove dependency on test. dart-lang/leak_tracker#159
  • Use adjustable settings: Update leak_tracker to use LeakTesting. dart-lang/leak_tracker#158
  • Avoid duplicate leak tracking and remove dependency on logging. dart-lang/leak_tracker#160
  • Separate 'memory_usage'
    • Create new package in monorepo
    • Update analyzer to use new package - https://dart-review.googlesource.com/c/sdk/+/334143
    • second attempt: https://dart-review.googlesource.com/c/sdk/+/335061
  • Update G3 to mirror 'leak_tracker' and 'leak_tracker_testing' from github
  • Remove dependencies on crypto, typed_data, web_socket_channel
  • Update leak_tracker_flutter_testing to contain all needed API
• Update testWidgetsWithLeakTracking to explicitly set leak tracking off in invoked testWidgets.
• Update flutter:
  • Take dependency on leak_tracker_flutter_testing: Reorganize dependencies on leak_tracker. #140233
  • Update testWidgets to track leaks
  • exclude leak tracking from leaky tests
  • Convert testWidgetsWithLeakTracking to testWidgets
• Cleanup leak_tracker:
  • test cover withRetainingPath for testWidgets in leak_tracker
  • remove testWidgetsWithLeakTracking
  • remove not-used fields from LeakTesting
  • remove memory usage from leak tracker
  • update documentation