Enhance Helm chart release workflow by adding cleanup step for local chart packages.

[saadqbal]

This prevents checkout errors when switching branches by ensuring no untracked files interfere with the process.

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Note

Low Risk
Low risk: a small CI workflow tweak that only deletes locally generated tracebloc-*.tgz files to prevent branch checkout failures; it doesn’t change chart packaging or release logic.

Overview
Prevents gh-pages checkout failures in the Helm chart release workflow by deleting any locally generated tracebloc-*.tgz files before switching branches, avoiding “untracked working tree files would be overwritten” errors.

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