dillon1000/react

[Fiber] Support AsyncIterable children in SuspenseList (#33299)

We support AsyncIterable (more so when it's a cached form like in coming
from Flight) as children.

This fixes some warnings and bugs when passed to SuspenseList.

Ideally SuspenseList with `tail="hidden"` should support unblocking
before the full result has resolved but that's an optimization on top.
We also might want to change semantics for this for
`revealOrder="backwards"` so it becomes possible to stream items in
reverse order.