fix: retirement PII leaks by redacting pending secondary email/name data

Author: ktyagiapphelix2u

openedx/core/djangoapps/user_api/management/tests/test_retire_user.py

@@ -5,11 +5,11 @@
 
 import csv
 import os
-from unittest import mock
 
 import pytest
 from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imported-auth-user
 from django.core.management import CommandError, call_command
+from django.db.models.signals import pre_delete
 
 from common.djangoapps.student.models import PendingSecondaryEmailChange
 from common.djangoapps.student.tests.factories import UserFactory  # lint-amnesty, pylint: disable=wrong-import-order