dillon1000/react

[Fabric] Fix reparenting bug in legacy Suspense mount (#21995)

* Add reparenting invariant to React Noop

Fabric does not allow nodes to be reparented, so I added the equivalent
invariant to React Noop's so we can catch regressions.

This causes some tests to fail, which I'll fix in the next step.

* Fix: Use getOffscreenContainerProps

The type of these props is different per renderer. An oversight
from #21960. Unfortunately wasn't caught by Flow because fiber props
are `any`-typed.

* [Fabric] Fix reparenting in legacy Suspense mount

Fixes a weird case during legacy Suspense mount where the offscreen host
container of a tree that suspends during initial mount is recreated
instead of cloned, since there's no current fiber to clone from.

Fabric considers this a reparent even though the parent from the first
pass never committed.

Instead we can override the props from the first pass before the
container completes. It's a bit of a hack, but no more so than the rest
of the legacy root Suspense implementation — the hacks are designed
to make it usable by non-strict mode-compliant trees.