Send an email when a workflow is send to an external

- create an event subscriber to catch the workflow which arrive to a "sentExternal" step;
- add a messenger's message to handle the generation of the email;
- add a simple message, and a simple controller for viewing the document
- add dedicated tests

src/Bundle/ChillMainBundle/Workflow/Messenger/PostSendExternalMessage.php

@@ -0,0 +1,20 @@
+<?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\Messenger;
+
+class PostSendExternalMessage
+{
+    public function __construct(
+        public readonly int $entityWorkflowId,
+        public readonly string $lang,
+    ) {}
+}

src/Bundle/ChillMainBundle/Workflow/Messenger/PostSendExternalMessageHandler.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\Messenger;
+
+use Chill\MainBundle\Entity\Workflow\EntityWorkflowSend;
+use Chill\MainBundle\Repository\Workflow\EntityWorkflowRepository;
+use Symfony\Bridge\Twig\Mime\TemplatedEmail;
+use Symfony\Component\Mailer\MailerInterface;
+use Symfony\Component\Messenger\Exception\UnrecoverableMessageHandlingException;
+use Symfony\Component\Messenger\Handler\MessageHandlerInterface;
+use Symfony\Component\Mime\BodyRendererInterface;
+
+final readonly class PostSendExternalMessageHandler implements MessageHandlerInterface
+{
+    public function __construct(
+        private EntityWorkflowRepository $entityWorkflowRepository,
+        private MailerInterface $mailer,
+        private BodyRendererInterface $bodyRenderer,
+    ) {}
+
+    public function __invoke(PostSendExternalMessage $message): void
+    {
+        $entityWorkflow = $this->entityWorkflowRepository->find($message->entityWorkflowId);
+
+        if (null === $entityWorkflow) {
+            throw new UnrecoverableMessageHandlingException(sprintf('Entity workflow with id %d not found', $message->entityWorkflowId));
+        }
+
+        foreach ($entityWorkflow->getCurrentStep()->getSends() as $send) {
+            $this->sendEmailToDestinee($send, $message);
+        }
+    }
+
+    private function sendEmailToDestinee(EntityWorkflowSend $send, PostSendExternalMessage $message): void
+    {
+        $email = new TemplatedEmail();
+        $email
+            ->to($send->getDestineeThirdParty()?->getEmail() ?? $send->getDestineeEmail())
+            ->htmlTemplate('@ChillMain/Workflow/workflow_send_external_email_to_destinee.html.twig')
+            ->context([
+                'send' => $send,
+                'lang' => $message->lang,
+            ]);
+
+        $this->bodyRenderer->render($email);
+        $this->mailer->send($email);
+    }
+}