Introduce $ZED_CUSTOM_PYTHON_ACTIVE_ZED_TOOLCHAIN_RAW to work around (cherry-pick #31685) (#31688)

gcp-cherry-pick-bot[bot] , Piotr Osiewicz , and Kirill Bulatov created

Cherry-picked Introduce $ZED_CUSTOM_PYTHON_ACTIVE_ZED_TOOLCHAIN_RAW to
work around (#31685)

Follow up to #31674 

Release Notes:

- N/A

Co-authored-by: Kirill Bulatov <mail4score@gmail.com>

Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
Co-authored-by: Kirill Bulatov <mail4score@gmail.com>

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