dillon1000/react

Track separate SuspendedOnAction flag by rethrowing a separate SuspenseActionException sentinel (#31554)

This lets us track separately if something was suspended on an Action
using useActionState rather than suspended on Data.

This approach feels quite bloated and it seems like we'd eventually
might want to read more information about the Promise that suspended and
the context it suspended in. As a more general reason for suspending.

The way useActionState works in combination with the prewarming is quite
unfortunate because 1) it renders blocking to update the isPending flag
whether you use it or not 2) it prewarms and suspends the useActionState
3) then it does another third render to get back into the useActionState
position again.