dillon1000/react

useActionState: Transfer transition context (#29694)

Mini-refactor of useActionState to only wrap the action in a transition
context if the dispatch is called during a transition. Conceptually, the
action starts as soon as the dispatch is called, even if the action is
queued until earlier ones finish.

We will also warn if an async action is dispatched outside of a
transition, since that is almost certainly a mistake. Ideally we would
automatically upgrade these to a transition, but we don't have a great
way to tell if the action is async until after it's already run.