Tag and Branchnames containing commit
The server implementation for ListTagNamesContainingCommit and
ListBranchNamesContainingCommit. Implementations call git for-each-ref
with the contains flag, eventhough the client at this time uses git branch and git tag. However, these are procelain, where we want to
use plumbing.
Part of #884 (closed)
Edited  by GitLab Release Tools Bot