Ensure dispatch from useFormState works in StrictMode

[eps1lon]

Summary

Closes #28556

We didn't follow the Rules of Hooks in the rerender implementation for mounts.

Test plan

• Added test based on "useFormState updates state asynchronously and queues multiple actions" but with StrictMode and less dispatches (because it repros on the first attempt)

Comparing: bbc571a...e32f38a

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js	=	176.83 kB	176.84 kB	+0.02%	54.91 kB	54.92 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js	=	173.55 kB	173.55 kB	=	54.11 kB	54.11 kB
facebook-www/ReactDOM-prod.classic.js	=	594.04 kB	594.07 kB	=	104.37 kB	104.38 kB
facebook-www/ReactDOM-prod.modern.js	=	577.30 kB	577.33 kB	=	101.42 kB	101.43 kB
test_utils/ReactAllWarnings.js	Deleted	66.87 kB	0.00 kB	Deleted	16.36 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	66.87 kB	0.00 kB	Deleted	16.36 kB	0.00 kB

Generated by 🚫 dangerJS against e32f38a

Since we don't actually need the result, all we need to do is advance the hook list.

Suggested change

	const [isPending] = rerenderState(false);
	updateWorkInProgressHook();

e32f38a (#28557)

Feels a bit brittle but you know this part better than I do.

I consider this pretty low level code so I think it's fine. I care more about not observing the value of isPending since it causes a bunch of redundant read operations.

This was introduced by #28514. Easy oversight to make, glad we caught it quickly.

Note that it doesn't just affect StrictMode, the same issue happen if you called setState during render to trigger a re-render. Or if you suspended with use after useFormState has already been called. That last one is the most idiomatic so I'd probably write the regression test using that pattern.