76739 Exposing ScrollBehaviors for app-wide settings (a: desktop, cla: yes, f: cupertino, f: material design, f: scrolling, framework, platform-web, severe: new feature, waiting for tree to go green)

76743 [flutter_tools] remove remaining extensions (cla: yes, tool, waiting for tree to go green)

76745 Toggleable Refactor (cla: yes, f: material design, framework, waiting for tree to go green)

76747 [flutter_tools] remove mockito from mdns client test (cla: yes, tool, waiting for tree to go green)

76748 [flutter_tools] migrate async guard to null safety (cla: yes, tool)

76752 Clarify what AndroidMotionEvent is for. (cla: yes, framework, waiting for tree to go green)