[temp] isolate replica tests

Author: timgraham

.github/workflows/test-python-replica.yml

@@ -55,4 +55,4 @@ jobs:
           mongodb-version: 6.0
           mongodb-replica-set: test-rs
       - name: Run tests
-        run: python3 django_repo/tests/runtests.py --settings mongodb_settings -v 2
+        run: python3 django_repo/tests/runtests_.py