dillon1000/react

Implement onError signature for renderToMarkup (#30170)

Stacked on #30132.

This way we can get parent and owner stacks from the error.

This forces us to confront multiple errors and whether or not a Flight
error that ends up being unobservable needs to really reject the render.

This implements stashing of Flight errors with a digest and only errors
if they end up erroring the Fizz render too. At this point they'll have
parent stacks so we can surface those.