Removes the unnecessary fields from bulk_access_users_by_email and
bulk_access_users_id, while also removing duplication of these lists
of fields.
"base_bulk_get_user_queryset", used when fetching a user
other than the acting user.
"base_get_user_queryset", used when fetching the acting user,
prefetching more fields.
There remains some inconsistency in the models.py functions that may
merit further investigation.
1847086044