dillon1000/react

[Fizz/Flight] Pass in Destination lazily to startFlowing instead of in createRequest (#22449)

* Pass in Destination lazily in startFlowing instead of createRequest

* Delay fatal errors until we have a destination to forward them to

* Flow can now be inferred by whether there's a destination set

We can drop the destination when we're not flowing since there's nothing to
write to.

Fatal errors now close once flowing starts back up again.

* Defer fatal errors in Flight too