Revert the workaround for Pulp 2 syncing from Pulp 3 repos
Ticket moved to GitHub: "pulp/pulp_rpm/2302":https://github.com/pulp/pulp_rpm/issues/2302
This was merged in order to workaround Pulp 2's inability to handle repositories where the package checksum type differed from the metadata checksum type. But there is nothing wrong with such repos, and we don't want to carry this behavior long-term.
Once we are no longer concerned with being able to sync Pulp 2 from repos produced by Pulp 3, we should revert the workaround.