76810 Removed BottomNavigationBar accentColor dependency (cla: yes, f: material design, framework)

76812 [flutter_tools] remove mock from terminal test (cla: yes, tool)

76813 [flutter_tools] remove mock from cmake project migrator (cla: yes, tool, waiting for tree to go green)

76820 Update dartdoc to 0.40.0. (cla: yes, team, waiting for tree to go green)

76821 [flutter_tools] replace most MockBuildSystem instances with TestBuildSystem (cla: yes, tool, waiting for tree to go green)

76829 Remove dead ensureDirectoryExists (cla: yes, team, tool, waiting for tree to go green)

76830 Add ephemeral iOS directory to put future generated files (cla: yes, platform-ios, tool, waiting for tree to go green)