Revert "perf!: allow calling register view in another view (#423)"

This reverts commit d303cec.

openedx/core/djangoapps/user_authn/views/register.py

@@ -217,7 +217,7 @@ def create_account_with_params(request, params):  # pylint: disable=too-many-sta
     is_marketable = params.get('marketing_emails_opt_in') in ['true', '1']
 
     # Perform operations within a transaction that are critical to account creation
-    with transaction.atomic():
+    with outer_atomic():
         # first, create the account
         (user, profile, registration) = do_create_account(form, custom_form)