[3.11] Also fail DO-NOT-MERGE when "awaiting changes" or "awaiting change review" present on PR (GH-103807) (#103814)

"awaiting changes" means somebody put a review that requested changes.

"awaiting change review" means that the PR author published changes
after a red review and then requested a re-review.

(cherry picked from commit b51da991e2f7b47efaee2665356060edb6a6ece4)