[cbuild] Do not create 'google' builds for presubmit cbuild results

Change-Id: Id1ae70c43c6e00bc82a710c545162684a0e27b70
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/178540
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Karl Klose <karlklose@google.com>
4 files changed