Implement new_edits flag on bulk updates

Will include further commits to implement new_edits flag - at the moment just has a failing test for revision IDs on bulk doc updates.
Would be shorter and nicer if we did something like:

    $storage = $this->entityManager->getStorage($entity_type_id);
    $entity = $storage->load($entity_id) ?: $storage->loadDeleted($entity_id);