Allow ref name caching CommitService#find_commit

Closes #57083

See merge request gitlab-org/gitlab-ce!26248

This reverts merge request !25476

For a given merge request, it's quite common to see duplicate FindCommit
Gitaly requests because the Gitaly CommitService caches the request by
the commit SHA, not by the ref name. However, most of the duplicate
requests use the ref name, so the cache is never actually used in
practice. This leads to unnecessary requests that slow performance.

This commit allows certain callers to bypass the ref name to
OID conversion in the cache. We don't do this by default because it's
possible the tip of the branch changes during the commit, which
would cause the caller to get stale data.

This commit also forces the Ci::Pipeline to use the full ref name
so that caching can work for merge requests.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/57083

Add a masked switch to variable rows
Copy some behavior from the protected switch

- concerns
- dashboard
- groups
- import

Remove expand diff to full file feature flag

See merge request gitlab-org/gitlab-ce!26614

This changes the repository type from a binary `wiki?` to a type. So
we can have more than 2 repository types.

Now everywhere we called `.wiki?` and expected a boolean, we check
that type.

In production, we see high error rates due to clients attempting to use
the dumb Git HTTP protocol with HEAD /foo/bar.git/info/refs
endpoint. This isn't supported and causes Error 500s because Workhorse
doesn't send along its secret because it's not proxying this request.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54579