fix: unseal: check if sealed/update sector exists

[rjan90]

Related Issues

fixes: #10222

Proposed Changes

Check if storiface.FTSealed or storiface.FTUpdate sector exists when SectorsUnsealPiece is called, and fail if they are not present.

Additional Info

lotus-miner storage find 111
In 94f8a49e-1208-442d-b960-9c6fca5ec2a0 (Cache)
        Sealing: true; Storage: true
        Local (/root/.lotus-miner-local-net)
        URL: http://127.0.0.1:2345/remote/cache/s-t01000-111

lotus-miner sectors unseal 111
ERROR: sealed or updated sector file not found for sector {1000 111}

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