77032 enable use_key_in_widget_constructors lint (a: accessibility, a: internationalization, a: tests, cla: yes, d: examples, f: cupertino, f: material design, framework, team, waiting for tree to go green)

77099 Turn on sized_box_for_whitespace lint, fix instances and tests. (a: accessibility, a: tests, cla: yes, d: examples, f: cupertino, f: material design, framework, team, waiting for tree to go green)

77194 [flutter_releases] Fix symlinks in prepare_packages script (a: tests, cla: yes, engine, f: cupertino, f: material design, framework, team, tool)

77294 Enable avoid_unnecessary_containers lint (a: accessibility, a: tests, cla: yes, f: cupertino, f: material design, framework, team, waiting for tree to go green)