Add workflow guard to block external send without public view

Introduce `EntityWorkflowGuardSendExternalIfNoPublicView` class to prevent workflows from transitioning to an external send state if the entity lacks a public view. Included unit tests to verify functionality for entities both with and without public views.

src/Bundle/ChillMainBundle/Workflow/EventSubscriber/EntityWorkflowGuardSendExternalIfNoPublicView.php

@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Workflow\EventSubscriber;
+
+use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
+use Chill\MainBundle\Workflow\EntityWorkflowManager;
+use Chill\MainBundle\Workflow\EntityWorkflowWithPublicViewInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\Workflow\Event\GuardEvent;
+use Symfony\Component\Workflow\Registry;
+use Symfony\Component\Workflow\TransitionBlocker;
+
+final readonly class EntityWorkflowGuardSendExternalIfNoPublicView implements EventSubscriberInterface
+{
+    public function __construct(private Registry $registry, private EntityWorkflowManager $entityWorkflowManager) {}
+
+    public static function getSubscribedEvents()
+    {
+        return ['workflow.guard' => [
+            ['guardSendExternalIfNoStoredObject', 0],
+        ]];
+    }
+
+    public function guardSendExternalIfNoStoredObject(GuardEvent $event)
+    {
+        $entityWorkflow = $event->getSubject();
+        if (!$entityWorkflow instanceof EntityWorkflow) {
+            return;
+        }
+
+        $workflow = $this->registry->get($entityWorkflow, $entityWorkflow->getWorkflowName());
+
+        foreach ($event->getTransition()->getTos() as $to) {
+            $metadata = $workflow->getMetadataStore()->getPlaceMetadata($to);
+            if (true === ($metadata['isSentExternal'] ?? false)
+                && !$this->entityWorkflowManager->getHandler($entityWorkflow) instanceof EntityWorkflowWithPublicViewInterface) {
+                $event->addTransitionBlocker(
+                    new TransitionBlocker(
+                        'No document associated with this entityWorkflow, not able to send external',
+                        'a95e57d8-9136-11ef-a208-43b111cfc66d'
+                    )
+                );
+
+                return;
+            }
+        }
+    }
+}