Avoid protected branches checks when verifying access without branch name

GitlabShell verify access sending ‘_any’ as the changes made on the git command, in those cases Gitlab::Checks::ChangeAccess won’t receive a branch_name so we don’t need to check for access to the 
protected branches on that repository. So we avoid some git operations in case the are not cached (empty_repo?) and some database lookups to get protected branches.

These request is happening in every push.

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