Revert "feat: store split modulestore's course indexes in Django/MySQL"

This reverts commit 96e5ff8dce.

lms/djangoapps/badges/backends/tests/test_badgr_backend.py

@@ -114,8 +114,7 @@ class BadgrBackendTestCase(ModuleStoreTestCase, EventTrackingTestCase):
         Verify badge spec creation works.
         """
         self.handler._get_access_token = Mock(return_value='12345')
-        with self.allow_transaction_exception():
-            self.handler._create_badge(self.badge_class)
+        self.handler._create_badge(self.badge_class)
         args, kwargs = post.call_args
         assert args[0] == 'https://example.com/v2/issuers/test-issuer/badgeclasses'
         assert kwargs['files']['image'][0] == self.badge_class.image.name

lms/djangoapps/badges/tests/test_models.py

@@ -196,8 +196,8 @@ class BadgeClassTest(ModuleStoreTestCase):
         Verify handing incomplete data for required fields when making a badge class raises an Integrity error.
         """
         image = get_image('good')
-        with pytest.raises(IntegrityError), self.allow_transaction_exception():
-            BadgeClass.get_badge_class(slug='new_slug', issuing_component='new_component', image_file_handle=image)
+        pytest.raises(IntegrityError, BadgeClass.get_badge_class, slug='new_slug', issuing_component='new_component',
+                      image_file_handle=image)
 
     def test_get_for_user(self):
         """