[Feature] Some subdirs not cleaning up venv on make clean

[daw3rd]

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After using a repo dir tree for a very long time, I have accumulated lots of venvs and other stuff (the dir tree was very large).
I ran make clean but still find the following directories containing venv dir

./transforms/packaging/venv
./kfp/kfp_support_lib/python_apiserver_client/venv
./kfp/kfp_support_lib/venv
./examples/notebooks/code/venv
./examples/notebooks/code/venv/lib/python3.10/site-packages/jedi/third_party/typeshed/stdlib/3/venv

Are you willing to submit a PR?

• Yes I am willing to submit a PR!