Allow suspending sequential revalidations if network request fails

[mglaman]

Package

next (Drupal module)

Describe the feature request

If there is an issue making a network request from Drupal to the Next.js site, additional failing requests can be sent out that wil also fail and add additional logs/processing time.

Describe the solution you'd like

If the first revalidation hits a network error or server error, halt sending any further validations.

Something like private readonly bool $halt = false in EntityActionEventRevalidateSubscriber and:

    if (!$this->halt && $revalidator = $this->nextEntityTypeManager->getRevalidator($event->getEntity())) {
      try {
        $revalidated = $revalidator->revalidate($event);
        // Dispatch post revalidation event.
        $revalidated_event = EntityRevalidatedEvent::createFromEntityActionEvent($event);
        $revalidated_event->setRevalidated($revalidated);
        $this->eventDispatcher->dispatch($revalidated_event, EntityEvents::ENTITY_REVALIDATED);
      catch (Exception) {
          $this->halt = true;
      }     
    }

If #445 this would be like re-queueing the existing item and suspending the queue.

Describe alternatives you've considered

Additional context

Add any other context about the problem here.