fix: Remove Helm chart publishing workflow

[abhijeet-dhumal]

What this PR does / why we need it:

ODH uses operator-based installation via manifests, so automated Helm chart publishing is not needed for this deployment method.

Checklist:

• Docs included if any changes are user facing

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[abhijeet-dhumal]

Instead of deleting the action workflow, will disable it via settings