dillon1000/react

Retry on error if there's lower priority pending work (#12957)

* Remove enableSuspense flag from PendingPriority module

We're going to use this for suspending on error, too.

* Retry on error if there's lower priority pending work

If an error is thrown, and there's lower priority work, it's possible
the lower priority work will fix the error. Retry at the lower priority.

If an error is thrown and there's no more work to try, handle the error
like we normally do (trigger the nearest error boundary).