dillon1000/react

[Flight] Add global onError handler (#21129)

* Add onError option to Flight Server

The callback is called any time an error is generated in a server component.

This allows it to be logged on a server if needed. It'll still be rethrown
on the client so it can be logged there too but in case it never reaches
the client, here's a way to make sure it doesn't get lost.

* Add fatal error handling