65871 Revert “Add CompositedTransformFollower.{followerAnchor, leaderAnchor} for custom anchoring (#64930)” (cla: yes, framework)

65876 Allow new methods to be added to ui.Image for tests (cla: yes, framework, team, waiting for tree to go green)

65877 Update Navigation Rail test with regression comment and cleaner size checking (cla: yes, f: material design, framework, waiting for tree to go green)

65878 Revert “Add CompositedTransformFollower.{followerAnchor, leaderAnchor… (cla: yes, framework)

65880 migrate some cupertino files to nullsafety (cla: yes, f: cupertino, framework, waiting for tree to go green)