[scanner] fix: repair Build and Deploy KC workflow

[kubestellar-hive]

Fixes #20548

Root cause

The deploy-vllm-d job failed at the "Recover stuck Helm release" step. The Helm release kc was in a failed state (from a prior deploy failure), so the step attempted helm rollback. The rollback itself failed — likely because there was no prior revision to roll back to (this happens when the very first install fails, leaving no rollback history).

The prior code hard-exited on rollback failure, permanently blocking all future deploys of the deploy-vllm-d job until manual Helm cleanup was performed on the cluster.

Fix

Added a fallback: when helm rollback fails for a stuck failed release, attempt helm uninstall to clear the stuck state. The subsequent "Deploy with Helm" step (which uses helm upgrade --install) will then perform a clean fresh install.

Changed step in deploy-vllm-d:

• If rollback fails → try helm uninstall instead of immediately exiting
• If uninstall also fails → exit with error (manual intervention still needed, but rollback failure alone no longer blocks all future deploys)

What was NOT changed

• deploy-pok-prod has an identical "Recover stuck Helm release" step with the same potential issue, but it succeeded in this run and is left for a follow-up to keep this PR minimal.

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[kubestellar-prow]

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[kubestellar-prow]

PR needs rebase.

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[clubanderson]

Closing as redundant: main already contains this exact fallback (helm uninstall when rollback fails, with a 5m timeout) in the deploy-vllm-d job, and the linked issue #20548 was closed before this PR was opened. Thanks anyway, scanner. 🐝