dillon1000/react

Do not unmount layout effects if ancestor Offscreen is hidden (#25628)

This is a follow up on https://github.com/facebook/react/pull/25592

There is another condition Offscreen calls
`recursivelyTraverseDisappearLayoutEffects` when it shouldn't. Offscreen
may be nested. When nested Offscreen is hidden, it should only unmount
layout effects if it meets following conditions:
1. This is an update, not first mount.
2. This Offscreen was hidden before.
3. No ancestor Offscreen is hidden.

Previously, we were not accounting for the third condition.