Remove unneeded Django Bulk Update #4409
Description
Observed behavior
We currently use the django_bulk_update library in three places in the code base to handle bulk updates to models.
Expected behavior
This has been handleable in Django directly since Django 2.2, so we should be able to replace these uses with the built in bulk_update queryset method: https://docs.djangoproject.com/en/3.2/ref/models/querysets/#bulk-update
Once this is done, we can then remove the django-bulk-update dependency