61841 Make sure all isolates start during flutter driver tests. (a: tests, cla: yes, framework, waiting for tree to go green)

61844 restore nullability of FlutterError.onError (cla: yes, framework)

61872 LiveTestWidgetsFlutterBinding support for non-touch event (a: tests, cla: yes, framework)

61876 Revert “fix intrinsic height and width for widget span (#61485)” (cla: yes, framework)

61881 [flutter_tools] Concise dart2js commands outputKernel & outputJavaScript (cla: yes, tool, waiting for tree to go green)

61882 Reland “Add support for Dart Development Service (DDS) in Flutter Tools (#61276)” (cla: yes, team, tool)