dillon1000/react

Fix useId in strict mode (#22681)

* Fix: useId in strict mode

In strict mode, `renderWithHooks` is called twice to flush out
side effects.

Modying the tree context (`pushTreeId` and `pushTreeFork`) is effectful,
so before this fix, the tree context was allocating two slots for a
materialized id instead of one.

To address, I lifted those calls outside of `renderWithHooks`. This
is how I had originally structured it, and it's how Fizz is structured,
too. The other solution would be to reset the stack in between the calls
but that's also a bit weird because we usually only ever reset the
stack during unwind or complete.

* Add test for render phase updates

Noticed this while fixing the previous bug