[1.7.x] Fixed stable/1.7.x test failures from refs #23699.

tests/fixtures_migration/tests.py

-from django.test import TestCase
 from django.core import management
+from django.test import TestCase
+from django.test.utils import override_system_checks
 
 from .models import Book
 
@@ -10,8 +11,9 @@ class TestNoInitialDataLoading(TestCase):
     in Django 1.9 when migrations become required and initial data is no longer
     supported.
     """
-    available_apps = ['django.contrib.auth', 'django.contrib.contenttypes', 'fixtures_migration']
+    available_apps = ['fixtures_migration']
 
+    @override_system_checks([])
     def test_migrate(self):
         self.assertQuerysetEqual(Book.objects.all(), [])
         management.call_command(
@@ -20,6 +22,7 @@ class TestNoInitialDataLoading(TestCase):
         )
         self.assertQuerysetEqual(Book.objects.all(), [])
 
+    @override_system_checks([])
     def test_flush(self):
         self.assertQuerysetEqual(Book.objects.all(), [])
         management.call_command(