53799 Add LICENSE file to packages/flutter, add test to make sure it’s picked up. (a: build, cla: yes, team)

53834 Replace isInstanceOf uses with isA (cla: yes, framework)

53838 Roll engine 46277fd2ca54..1adfd639b465 (23 commits) (cla: yes, waiting for tree to go green)

53845 Roll engine 1adfd639b465..8166a91bca11 (2 commits) (cla: yes, waiting for tree to go green)

53846 Add toggleable attribute to Radio (cla: yes, f: material design, framework)

53851 only auto-lock issues, not pull requests (cla: yes)