93434 Added useMaterial3 flag to ThemeData. (framework, f: material design, cla: yes, waiting for tree to go green)

93448 [flutter_releases] Flutter beta 2.8.0-3.1.pre Framework Cherrypicks (team, framework, engine, f: material design, cla: yes, d: api docs, d: examples, documentation)

93452 ChipThemeData is now conventional (framework, f: material design, cla: yes, waiting for tree to go green)

93463 API to generate a ColorScheme from a single seed color. (team, framework, f: material design, cla: yes, waiting for tree to go green, integration_test)

93478 Add splashRadius property to IconTheme  (framework, f: material design, cla: yes, f: cupertino, waiting for tree to go green)