Skip dbhash check for temporary collections in shard split passthroughs

A number of jstests test commands which might create temporary collections as a side-effect of normal operation. Usually, it's okay to check these temp collections during dbhash checks but shard split has an implicit stepup (to elect a recipient primary) which will clear temp collections. In this case, we see dbhash check failures because the donor has the temp collection, and the recipient does not.