84218 [flutter_tools] remove remaining mocks from cache_test.dart (tool, cla: yes, waiting for tree to go green)

84227 Migrate android application_package to null safety (team, tool, cla: yes, waiting for tree to go green, a: null-safety)

84246 Update outdated ios setup link in error message (tool, cla: yes, waiting for tree to go green)

84256 alignment of doc comments and annotations (a: tests, team, tool, framework, a: internationalization, cla: yes, f: cupertino, waiting for tree to go green)

84273 [flutter_tools] switch flutter sdk to dart format (tool, cla: yes, waiting for tree to go green)

84293 fix indentation of class members (team, tool, framework, cla: yes, waiting for tree to go green)