68790 [devicelab] de-flake iOS launch (cla: yes, tool)

68791 Update to dartdoc 0.36.1 (cla: yes, team, waiting for tree to go green)

68793 Move service extension to correct binding so images are repainted after enabling/disabling, update test (cla: yes, framework)

68794 Add bottom to search bar (cla: yes, f: material design, framework, team)

68804 fix simple dialog introducing additional node for semantics label (cla: yes, f: material design, framework)

68807 Make Material/CupertinoLocalizations non-nullable (cla: yes, f: cupertino, f: material design, framework)

68812 Handle backspace in text fields (cla: yes, framework)