fix: unsealed sector for synthetic PoRep

[LexLuthr]

This PR makes the following changes:

1. Generating Unsealed is now a separate function called GenerateUnsealedSector()
2. This function is called by Synthetic Task if required and generating the unsealed sector before removing the cache.
3. Finalize calls generating unseal only if proof types is not synthetic.
4. Acquiring sector from Storage is still done by the primary function in each task as passed to GenerateUnsealedSector().

• Test in calibnet

[phapawit-hir]

Hi there,

it works.