feat: djang-cor-headers need schemes with urls. Adding condition to switch lists with different version.

With the PR it will load the old `CORS_ORIGIN_WHITELIST` since there is no change in `djang-cor-headers` version. In next PR this version will get upgraded.

lms/djangoapps/experiments/tests/test_views.py

@@ -13,6 +13,7 @@ from django.core.handlers.wsgi import WSGIRequest
 from django.test.utils import override_settings
 from django.urls import reverse
 from django.utils.timezone import now
+from importlib_metadata import version
 from rest_framework.test import APITestCase
 
 from common.djangoapps.student.tests.factories import UserFactory
@@ -260,6 +261,11 @@ class ExperimentCrossDomainTests(APITestCase):
             **kwargs
         )
 
+    def test_white_list_contents_with_cors_header_version(self, *args):  # pylint: disable=unused-argument
+        """ Verify that with django-cor-header<3 it loads list without scheme. """
+        assert settings.CORS_ORIGIN_WHITELIST == ['sandbox.edx.org']
+        assert int(version('django_cors_headers').split('.')[0]) == 2
+
 
 class ExperimentKeyValueViewSetTests(APITestCase):  # lint-amnesty, pylint: disable=missing-class-docstring