80792 Modified TabBar.preferredSize to remove hardcoded knowledge about child Tab. (team, framework, f: material design, cla: yes, a: quality, waiting for tree to go green, tech-debt)

80817 fix sort_directives violations (a: tests, team, tool, framework, f: material design, a: accessibility, cla: yes, f: cupertino, waiting for tree to go green)

80822 Migrate ios_add2app_life_cycle to earlgrey 2 and latest iOS SDK (a: tests, team, cla: yes)

80834 [flutter_conductor] begin migrating //flutter/dev/tools to null-safety (team, f: material design, cla: yes, f: cupertino, waiting for tree to go green)

80841 Migrate customer_testing to null safety (team, cla: yes)