refactor: update test assertions to reflect renaming

Author: BryanttV

openedx/core/djangoapps/user_api/accounts/tests/test_forms.py

@@ -231,8 +231,8 @@ def test_get_extended_profile_form_exception_during_creation(self, mock_get_form
             form, errors = get_extended_profile_form(extended_profile_fields_data, self.user)
 
         self.assertIsNone(form)  # noqa: PT009
-        self.assertIn("extended_profile", errors)  # noqa: PT009
-        self.assertIn("Error creating custom form", errors["extended_profile"]["developer_message"])  # noqa: PT009
+        self.assertIn("profile_extension", errors)  # noqa: PT009
+        self.assertIn("Error creating custom form", errors["profile_extension"]["developer_message"])  # noqa: PT009
 
 
 class TestValidateAndGetExtendedProfileForm(TestCase):