prune_old_datasources was renamed to delete_orphaned_ucrs
prune_old_datasources was renamed to delete_orphaned_ucrs

despite its name, there is still a way to identify orphaned tables
without deleting them.

dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq