support startTransition in useMutation and useSubscription

[matclayton]

Sorry if this is a misunderstanding of how startTransition should be used. But we would ideally like to use useSubscription / @prependNode to append items to a list via a transition. This is working nicely using @prependNode (or an update function), without transitions. But when we can't figure out how to successfully trigger the startTransition and have it cause the ViewTransitions to animate, is this expected behaviour?

So far we've tried,

1. Seeing if it just worked.
2. Adding startTransition to the onNext/update calls