Search backend: remove passed-in RepoOptions from Paginate signature
Created by: camdencheek
We've got some duplication in the API for repo search since options can either be passed in through Paginate or passed in as a field of the resolver. This removes the less-used first option. This is not an opinion on which way is better, but rather just a "make it work one way" thing.
Test plan
Should not change behavior. Depending on existing tests.