dillon1000/react

Encode lazy Node slots properly in key path and resumable paths (#27359)

It's possible to postpone a specific node and not using a wrapper
component. Therefore we encode the resumable slot as the index slot.
When it's a plain client component that postpones, it's encoded as the
child slot inside that component which is the one that's postponed
rather than the component itself.

Since it's possible for a child slot to suspend (e.g. React.lazy's
microtask in this case) retryTask might need to keep its index around
when it resolves.