Tox: Do not ignore "tests/extract" when running tests (#6377)

tox.ini

@@ -23,7 +23,7 @@ commands =
     pre-commit run --all-files
     sh -c "SITE_URL=https://treeherder.dev TREEHERDER_DEBUG=False ./manage.py check --deploy --fail-level WARNING"
     # Exercising running tests outside of Docker
-    pytest tests/ --ignore=tests/selenium --ignore=tests/extract
+    pytest tests/ --ignore=tests/selenium
 commands_post =
     # This is to deal with running the containers with --detached
     docker-compose down