feat: curio: Cleanup data copies after seal ops

[magik6k]

Related Issues

Proposed Changes

This PR makes it so that after each porep pipeline step tasks will ensure that only the latest version of sector files remain in storage. This should make future retry logic much easier to implement - e.g. retrying SDR will now just be setting after_sdr/after_tree.. fields for a given sector to false.

Additional Info

Checklist

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[magik6k]

Seems to be broken in some mysterious way, trying to debug what's going on here