test: update import linter

Author: bradenmacdonald

setup.cfg

@@ -185,10 +185,12 @@ isolated_apps =
     openedx.core.djangoapps.olx_rest_api
     openedx.core.djangoapps.xblock
     openedx.core.lib.xblock_serializer
+    openedx_catalog
 allowed_modules =
     # Only imports from api.py and data.py are allowed elsewhere in the code
     # See https://open-edx-proposals.readthedocs.io/en/latest/best-practices/oep-0049-django-app-patterns.html#api-py
     api
+    models_api
     data
     tests