fix: local storage reservations fixes

[magik6k]

Related Issues

Proposed Changes

More debugging of accounting issues in the storage reservation mechanism in Curio.

• This PR adds a lot more debug logging to storage reservation code
• Fixes a bug in curio task storage where in some cases we'd release storage multiple times
  • Fixed with sync.once as other ways of fixing it would be either very complicated or would trade robustness in favour of sometimes maybe not releasing storage
• Also a small drive-by fix which drops existing SDR layers on sdr restart - seems like this was one of the causes of corrupted sectors

Currently testing on my mainnet setup, seems to work very well so far

Additional Info

Checklist

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