zoekt: treat repo names case sensitively
Created by: keegancsmith
Previously we treated zoekt repositories as if the case would not match what is returned from the repo database. However, Zoekt requires the correct caseing of the repo name to do the search. Additionally Zoekt uses the correct casing of the repo name when indexing.
So the uses of ToLower when checking if a repo was indexed was unnecessary. Additionally in the case a repository name changed case we would incorrectly believe we have indexed the repo, but the actual zoekt search would fail due to the index being case sensitive.
Additionally avoiding the calls to ToLower should improve performance. However, I didn't validate this (but naively it should).