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[Fiber] Some setState related issues (#8010)

* Use the memoized props/state from the workInProgress

We don't want to use the "current" props/state because if we have
started work, then pause and continue then we'll have the newer
props/state on it already. If it is not a resume, it should be the
same as current.

* Deprioritize setState within a deprioritized tree

Currently we flag the path to a setState as a higher priority
than "offscreen". When we reconcile down this tree we bail out
if it is a hidden node. However, in the case that node is already
completed we don't hit that bail out path. We end up doing the
work immediately which ends up committing that part of the tree
at a higher priority.

This ensures that we don't let a deprioritized subtree get
reconciled at a higher priority.

* Bump idx in unit test

This proves that this number is actually deprioritized.

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