93161 Revert “Added widgets/AppModel” (team, framework, f: material design, cla: yes, d: api docs, d: examples, waiting for tree to go green, documentation)

93165 Roll Plugins from 27eda487859c to 5bf7fb0360aa (1 revision) (cla: yes, waiting for tree to go green)

93166 Do not rebuild when TickerMode changes (a: text input, framework, cla: yes, waiting for tree to go green)

93168 [flutter_tools] Catch lack of flutter tools source missing (a: text input, tool, cla: yes)

93170 Desktop edge scrolling (a: text input, framework, f: material design, cla: yes, f: cupertino, waiting for tree to go green)