[monorepo] Don't download fuchsia dependencies in monorepo checkout

Change-Id: Ie92c043c0ec26e8e6ba7f922734c94b5286507e4
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/361922
Reviewed-by: Jonas Termansen <sortie@google.com>
Commit-Queue: William Hesse <whesse@google.com>
4 files changed