73052 Avoid broken symlinks in embedded Flutter frameworks (cla: yes, platform-mac, team, tool, waiting for tree to go green)

74006 Remove smoke_catalina_hot_mode_dev_cycle__benchmark (a: tests, cla: yes, platform-mac, team, team: infra)

a: null-safety - 21 pull request(s)

62616 Migrate foundation test to nullsafety (a: accessibility, a: null-safety, cla: yes, framework)

62701 Migrate gestures, physics and scheduler tests to null safety. (a: null-safety, cla: yes, framework)

67106 [null-safety] allow web shard to compile null-safe tests. (a: null-safety, cla: yes, tool)