If a repository were deleted, the Gitaly implementation of
list_commits_by_oid would catch a GRPC NotFound error and simply return
an empty set.

However, the Rugged implementation would throw an NoRepository
exception. This would prevent a repository from being deleted.

We make the Rugged implementation consistent with Gitaly since the
behavior of destroying projects and CI pipelines relies on the Gitaly
implementation.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/349414

Changelog: fixed