Disable Deadlock retries for Mailing Jobs
So CiviCRM added a feature which re-tries the same query x number of times by default that is 3 when either a deadlock or a lock wait timeout is hit which is useful, but in the concept of mailing job processing it is not so useful because it means it can get tied up on get_lock queries re-trying them a silly number of times when it should be moving onto the next thing