The devtools cipd packages are now automatically built in the secure
release infrastructure and humans are no longer able to directly upload
the cipd packages. Cherry-picks to the release branches are handled by
specially triggering the secure builder.
Bug: b/297020298
Change-Id: I8d587cf787b85abea1762c7f302b261298adf83d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/323640
Reviewed-by: William Hesse <whesse@google.com>
Commit-Queue: Jonas Termansen <sortie@google.com>