Failure: https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20framework_tests_libraries/13763/overview

If gesture is started, it should be finished to release resources:

final TestGesture gesture = await tester.startGesture(
...
// Finish gesture to release resources.
await tester.pumpAndSettle();
await gesture.up();
await tester.pumpAndSettle();

If it is not finished, ValueNotifier<_OverlayEntryWidgetState?> will not be disposed.

• allow leak to open tree: Allow leaks around tap down/up, while flackiness is not fixed. #136133
• fix for the failed test: Fix leaks in the test. #136134
• fix for other tests and doc comment: Fix flakiness: finalize dropped gestures in tests to release resources, and update doc-comment. #136136
• add doc to leak tracker: Document leak of dropped gesture. dart-lang/leak_tracker#151