77657 Explain why devtools in pinned (cla: yes, team, waiting for tree to go green)

77749 Remove mockito deps from dev (cla: yes, team, tool, waiting for tree to go green)

77754 Add mouseCursor, onEnter, and onExit to TextSpan (cla: yes, f: cupertino, f: material design, framework, team, waiting for tree to go green)

77837 non-breaking changes recommended by prefer_mixin lint (a: tests, cla: yes, f: material design, framework, team, waiting for tree to go green)

77850 [flutter_releases] Flutter 2.0.2 Stable Framework Cherrypicks (a: tests, cla: yes, engine, f: cupertino, f: material design, framework, team, tool)