Fix DraggableScrollableSheet and ListView has tiny scroll of one pixel by @xu-baolin in https://github.com/flutter/flutter/pull/109081

[framework] Animatable.fromCallback and code snippet by @jonahwilliams in https://github.com/flutter/flutter/pull/108661

Reland: “Add example and troubleshooting comment for showSnackBar” by @bleroux in https://github.com/flutter/flutter/pull/105195

Deprecate ThemeData.selectedRowColor by @Piinks in https://github.com/flutter/flutter/pull/109070

Reland: “Add outlineVariant and scrim colors to ColorScheme” by @guidezpl in https://github.com/flutter/flutter/pull/109203