78755 Typo fixes (a: internationalization, a: tests, cla: yes, f: cupertino, f: material design, framework, team, tool)

78757 [State Restoration] Code sample templates, migrate existing code samples (a: state restoration, cla: yes, d: api docs, f: cupertino, f: material design, framework, team)

78815 Automatically activate testfield in macOS when receives accessibility… (cla: yes, f: cupertino, f: material design, framework, waiting for tree to go green)

78928 change all dynamic slot to Object type (cla: yes, f: cupertino, f: material design, framework)

79049 use null aware operators for function invocations (a: tests, cla: yes, f: cupertino, f: material design, framework, team, waiting for tree to go green)