Rebase to include changes to use recipes from folders.

Change-Id: I7071324742256f176c8abe23d74cb8f518661b00
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/27040
Reviewed-by: Yusuf Mohsinally <mohsinally@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>