[various] update agp and gradle for all examples in packages - #3822

[various] update agp and gradle for all examples in packages#3822

reidbaker merged 29 commits into

flutter:mainflutter/packages:mainfrom

reidbaker:i122213-run-agp-update-for-manyreidbaker/packages:i122213-run-agp-update-for-manyCopy head branch name to clipboard