Backport EE changes. Service method should be `get` and not `all`
What does this MR do?
Backports EE changes made in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1233 in this commit: https://gitlab.com/gitlab-org/gitlab-ee/commit/1d30feef080bd3935ef1aa51a3e852bfcb5bda02#97aede8de546a9928bcbd0b98db6d80f8ceb4433_92_92