batched_multi_deletes_a.js, batched_multi_deletes_id.js, and batched_multi_deletes.js had a comment stating `This test does not rely on getMores on purpose, as this is a requirement for running on tenant migration passthroughs.`

Now that the tenant migration feature has been removed starting 8.1, these tests should be looked over to see if any changes are needed since this comment is not relevant anymore.