85359 Split project.dart into CMake and Xcode projects (tool, cla: yes, waiting for tree to go green, tech-debt)

86323 Dart Fixes for clipBehavior breaks (team, framework, f: material design, cla: yes, f: cupertino, a: quality, waiting for tree to go green, tech-debt)

86369 Add fixes for ThemeData (team, framework, f: material design, cla: yes, waiting for tree to go green, tech-debt)

86808 Remove unused build_mode_test (a: tests, team, cla: yes, waiting for tree to go green, tech-debt)

86812 Remove unused flutter_gallery_instrumentation_test (team, cla: yes, waiting for tree to go green, tech-debt)