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

This reverts commit 96e5ff8dce.

lms/djangoapps/course_api/blocks/tests/test_api.py

@@ -224,17 +224,23 @@ class TestGetBlocksQueryCounts(TestGetBlocksQueryCountsBase):
             )
 
     @ddt.data(
-        (ModuleStoreEnum.Type.mongo, 5, True, 23),
-        (ModuleStoreEnum.Type.mongo, 5, False, 13),
-        (ModuleStoreEnum.Type.split, 2, True, 24),
-        (ModuleStoreEnum.Type.split, 2, False, 14),
+        *product(
+            ((ModuleStoreEnum.Type.mongo, 5), (ModuleStoreEnum.Type.split, 3)),
+            (True, False),
+        )
     )
     @ddt.unpack
-    def test_query_counts_uncached(self, store_type, expected_mongo_queries, with_storage_backing, num_sql_queries):
+    def test_query_counts_uncached(self, store_type_tuple, with_storage_backing):
+        store_type, expected_mongo_queries = store_type_tuple
         with override_waffle_switch(STORAGE_BACKING_FOR_CACHE, active=with_storage_backing):
             course = self._create_course(store_type)
             clear_course_from_cache(course.id)
 
+            if with_storage_backing:
+                num_sql_queries = 23
+            else:
+                num_sql_queries = 13
+
             self._get_blocks(
                 course,
                 expected_mongo_queries,