51419 [flutter_tools] Rework iOS vmservice handshake failure usage event (platform-ios, tool)

51428 Add debugDoingBuild flag (cla: yes, framework)

51435 remove isinitialroute from RouteSettings (cla: yes, framework, severe: API break)

51436 [flutter_tools] Don’t try to run pub before the version command (cla: yes, tool)

51438 Implement VisualDensity for text fields. (a: desktop, cla: yes, f: material design, framework, team)

51439 Reduce closure allocation in RenderObject.cleanRelayoutBoundary (cla: yes, framework)

51440 [flutter_tool] Where possible, catch only subtypes of Exception (cla: yes, tool)

51441 Revert “Live image cache” (cla: yes, framework, team)