82589 Fix typos (a: tests, team, tool, framework, f: material design, cla: yes, f: cupertino, waiting for tree to go green)

82601 [flutter_conductor] Auto apply dart revision (team, cla: yes)

82611 Migrate manual_tests to null safety (team, f: material design, cla: yes, waiting for tree to go green)

82719 add –verbose flag to pub global activate (team, cla: yes)

82739 [flutter_tools] support memory profiles from flutter drive (team, tool, cla: yes, waiting for tree to go green)

82754 Gardening: mark flaky tests flaky. (team, cla: yes, waiting for tree to go green)