66652 [Material] Update some semantics for time picker controls (cla: yes, f: material design, framework)

66653 Changed TickerProviderStateMixin to SingleTickerProviderStateMixin in… (cla: yes, f: material design, framework)

66663 Migrate flutter_test (a: tests, cla: yes, f: cupertino, f: material design, framework, team, waiting for tree to go green)

66670 Updated tests in material/bottom_navigation_bar_test.dart (cla: yes, f: cupertino, f: material design, framework, waiting for tree to go green)

66684 [Icons][iOS] Pointing to version of material icon font that includes more metadata in the xml. (cla: yes, f: material design, waiting for tree to go green)