feat!: Remove django-admin default login (#29876)

* feat!: Remove django-admin default login

openedx/core/tests/test_admin_view.py

@@ -6,8 +6,9 @@ This is not inside a django app because it is a global property of the system.
 
 from django.test import Client, TestCase
 from django.urls import reverse
-from edx_toggles.toggles.testutils import override_waffle_switch
+from edx_toggles.toggles.testutils import override_waffle_switch, override_waffle_flag
 from common.djangoapps.student.tests.factories import UserFactory, TEST_PASSWORD
+from openedx.core.djangoapps.user_authn.config.waffle import ADMIN_AUTH_REDIRECT_TO_LMS
 
 from openedx.core.djangoapps.user_authn.views.login import ENABLE_LOGIN_USING_THIRDPARTY_AUTH_ONLY
 
@@ -43,6 +44,16 @@ class TestAdminView(TestCase):
             response = self.client.get(reverse('admin:login'))
             assert response.url == '/login?next=/admin'
             assert response.status_code == 302
+
+        with override_waffle_flag(ADMIN_AUTH_REDIRECT_TO_LMS, True):
+            response = self.client.get(reverse('admin:login'))
+            assert response.url == '/login?next=/admin'
+            assert response.status_code == 302
+
         with override_waffle_switch(ENABLE_LOGIN_USING_THIRDPARTY_AUTH_ONLY, False):
             response = self.client.get(reverse('admin:login'))
             assert response.template_name == ['admin/login.html']
+
+        with override_waffle_flag(ADMIN_AUTH_REDIRECT_TO_LMS, False):
+            response = self.client.get(reverse('admin:login'))
+            assert response.template_name == ['admin/login.html']