[Bug][Resolver] Enable caching for reusable workflow

[malhotra5]

End-user friendly description of the problem this fixes or functionality that this introduces

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Give a summary of what the PR does, explaining any non-trivial design decisions

There is a bug that bypasses the expected caching step when .github/workflows/openhands-resolver.yml is invoked as a reusable workflow.

This PR fixes the bug.

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Link of any specific issues this addresses