fix(cache): Trigger cacache to remove expired contents

[gg-kialo]

Changes

Verify the cacache after removing index entries at the end of a run to remove cache contents on disk.

The existing cacache cleanup is only removing cache entries from the index, not the contents.
This results in the cache contents being forgotten about and continuing to accrue on disk.

Verifying with cacache.verify(...) will garbage collect any content entries not referenced by the index as well as cleaning up corrupted or invalid index entries.

Context

Closes #28169.

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[renovate-release]

🎉 This PR is included in version 37.280.4 🎉

The release is available on:

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• npm package (@latest dist-tag)
• 37.280.4

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