[All customers] Duo Code Review: enable automatic review for multiple projects within namespace

Identical to [gitlab.com] Duo Code Review: enable automatic ... (#554070 - closed) but just enabling the support for self-managed customers which is currently blocked until %18.7 due to required-stop and pending finalization of ResetAutoDuoCodeReviewFalseValues BBM in %18.6 (required stop is %18.5).