Update tests: 1. automl.py

.flake8

@@ -5,6 +5,7 @@ extend-exclude =
     venv
     .venv
     build
+    autosklearn/automl_common
 extend-ignore =
     # No whitespace before ':' in [x : y]
     E203

.github/workflows/pytest.yml

@@ -137,6 +137,8 @@ jobs:
     - name: Check for files left behind by test
       if: ${{ always() }}
       run: |
+        # Deleting `.pytest_chache` as it's used during testing and not deleted
+        rm -rf ".pytest_cache"
         before="${{ steps.status-before.outputs.BEFORE }}"
         after="$(git status --porcelain -b)"
         if [[ "$before" != "$after" ]]; then