92945 [TextInput] send setEditingState before show to the text input plugin when switching input clients (a: text input, framework, cla: yes, waiting for tree to go green)

92946 Add Help menu to macOS create template (team, tool, cla: yes, waiting for tree to go green, integration_test)

92948 Remove globals_null_migrated.dart, move into globals.dart (tool, cla: yes, waiting for tree to go green)

92950 Migrate channel, clean and a few other commands to null safety (tool, cla: yes, waiting for tree to go green)

92952 Migrate doctor, format, and a few other commands to null safety (tool, cla: yes, waiting for tree to go green, a: null-safety, tech-debt)