Merge branch '22655-deployments-don-t-always-have-keep-around-refs' into 'master'
Handle case where deployment ref no longer exists ## What does this MR do? In 8.9, we didn't create keep-around refs for deployments. So it's possible that someone created a deployment (say, for testing), and then deleted the branch and all other references to that commit. That commit could then get GCed, and trying to view MRs on 8.11+ will show a 500. See https://gitlab.com/gitlab-org/gitlab-ce/issues/22655#note_16575020 for more details. ## Why was this MR needed? If someone created a deployment on 8.9, then deleted all references to the commit for that deployment, we will throw an exception when checking if the deployment includes a commit. Closes #22655. See merge request !6855
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