61502 Update documentation for IntrinsicWidth & IntrinsicHeight (cla: yes, d: api docs, documentation, framework)

61503 Add defaults to showGeneralDialog() (cla: yes, framework)

61509 Add a E2E based performance test case (a: tests, cla: yes, framework, team, waiting for tree to go green)

61516 Allow transparent barrierColor in showDialog methods (cla: yes, framework)

61532 [ListTileTheme] adds properties to customize tile color at theme level (cla: yes, f: material design, framework, waiting for tree to go green)

61540 Promote WidgetTester.ensureVisible to WidgetController (a: tests, cla: yes, framework)

61556 fix type error in web builds (cla: yes, cp: 1.20, cp: 1.20 completed, framework)