Python: Add safe manual workflow canary test

[areksaxyz]

Adds a safe canary test for workflow investigation.

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[areksaxyz]

Hi maintainers,

Could someone with permission please run the "Integration Tests (Manual)" workflow for this PR with:
pr-number: 5096

This PR only adds a safe canary test under python/ for workflow validation. It does not read secrets, dump environment variables, access cloud resources, or make external network calls. It only prints an AF_CANARY marker and intentionally fails in reusable workflow runs so the execution path is visible in logs.

A run link is enough. Thank you.

@eavanvalkenburg @kshyju