42637 Re-enable asserts on Windows integration tests (a: tests, cla: yes, team)

42640 Add more structure to errors (continuation of #34684) (a: tests, cla: yes, f: cupertino, f: material design, framework)

42655 resident_web_runner doesn’t close debug connection (cla: yes, tool)

42656 Catch appInstanceId error (cla: yes, tool)

42668 dispose devices on cleanupAtFinish() for run_cold.dart (cla: yes, tool, waiting for tree to go green)

42676 [web] Update web runner message with flutter.dev/web (cla: yes, tool, waiting for tree to go green)

42683 Optimize focus operations by caching descendants and ancestors. (cla: yes, f: material design, framework)