Remove review-cleanup from MR pipelines

Question

review-cleanup removes stale Review Apps and is run by default in master and manual in MRs: https://docs.gitlab.com/ee/development/testing_guide/review_apps.html#auto-stopping-of-review-apps.

Is there a reason it's needed in MRs? It's often mixed up with review-stop when there's an issue that requires team members to review-stop and re-review-deploy the review app