allow external-contributors to push to tesora-trove-dashboard
allow external-contributors to push to tesora-trove-dashboard

'Final' privileges of approved user(s):
- can push reviews to trove-dashboard, any branch
- can +1/-1 code review trove-dashboard reviews
- can comment on any review in any public repo.

Change-Id: Icbf18c26aa5392c782725162fe7c5125cfe9d859

Tesora/tesora-project-config,Tesora/tesora-project-config