test: switch default test store to the split store

It's long past time that the default test modulestore was Split,
instead of Old Mongo. This commit switches the default store and
fixes some tests that now fail:
- Tests that didn't expect MFE to be enabled (because we don't
  enable MFE for Old Mongo) - opt out of MFE for those
- Tests that hardcoded old key string formats
- Lots of other random little differences

In many places, I didn't spend much time trying to figure out how to
properly fix the test, and instead just set the modulestore to Old
Mongo.

For those tests that I didn't spend time investigating, I've set
the modulestore to TEST_DATA_MONGO_AMNESTY_MODULESTORE - search for
that string to find further work.

openedx/core/djangoapps/enrollments/tests/test_views.py

@@ -9,6 +9,8 @@ import itertools
 import json
 import unittest
 from unittest.mock import patch
+from urllib.parse import quote
+
 import pytest
 import ddt
 import httpretty
@@ -23,6 +25,8 @@ from django.urls import reverse
 from freezegun import freeze_time
 from rest_framework import status
 from rest_framework.test import APITestCase
+from xmodule.modulestore.tests.django_utils import TEST_DATA_MONGO_AMNESTY_MODULESTORE, ModuleStoreTestCase
+from xmodule.modulestore.tests.factories import CourseFactory, check_mongo_calls_range
 
 from common.djangoapps.course_modes.models import CourseMode
 from common.djangoapps.course_modes.tests.factories import CourseModeFactory
@@ -43,8 +47,6 @@ from common.djangoapps.student.roles import CourseStaffRole
 from common.djangoapps.student.tests.factories import AdminFactory, SuperuserFactory, UserFactory
 from common.djangoapps.util.models import RateLimitConfiguration
 from common.djangoapps.util.testing import UrlResetMixin
-from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase  # lint-amnesty, pylint: disable=wrong-import-order
-from xmodule.modulestore.tests.factories import CourseFactory, check_mongo_calls_range  # lint-amnesty, pylint: disable=wrong-import-order
 
 
 class EnrollmentTestMixin:
@@ -1598,6 +1600,7 @@ class CourseEnrollmentsApiListTest(APITestCase, ModuleStoreTestCase):
     """
     Test the course enrollments list API.
     """
+    MODULESTORE = TEST_DATA_MONGO_AMNESTY_MODULESTORE
     CREATED_DATA = datetime.datetime(2018, 1, 1, 0, 0, 1, tzinfo=pytz.UTC)
 
     def setUp(self):
@@ -1698,12 +1701,12 @@ class CourseEnrollmentsApiListTest(APITestCase, ModuleStoreTestCase):
 
     def test_user_not_authenticated(self):
         self.client.logout()
-        response = self.client.get(self.url, {'course_id': str(self.course.id)})
+        response = self.client.get(self.url, {'course_id': quote(str(self.course.id))})
         assert response.status_code == status.HTTP_401_UNAUTHORIZED
 
     def test_user_not_authorized(self):
         self.client.login(username=self.student1.username, password='edx')
-        response = self.client.get(self.url, {'course_id': str(self.course.id)})
+        response = self.client.get(self.url, {'course_id': quote(str(self.course.id))})
         assert response.status_code == status.HTTP_403_FORBIDDEN
 
     @ddt.data(