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

93175 Added SharedAppData to the widgets library (team, framework, f: material design, cla: yes, d: api docs, d: examples, documentation, will affect goldens)

93204 Revert “Reland Reland engine display features” (team, tool, engine, a: accessibility, cla: yes, d: api docs, d: examples, documentation, integration_test)

93240 Reland 3: Display Features (team, tool, engine, a: accessibility, cla: yes, d: api docs, d: examples, waiting for tree to go green, documentation, integration_test)