Add export generation creation from saved export endpoint

Introduce a new controller for creating export generations from saved exports using a POST endpoint. Updates include a new route, serialization groups, and a corresponding test to validate functionality.

src/Bundle/ChillMainBundle/Controller/ExportGenerationCreateFromSavedExportController.php

@@ -0,0 +1,62 @@
+<?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\Controller;
+
+use Chill\MainBundle\Entity\ExportGeneration;
+use Chill\MainBundle\Entity\SavedExport;
+use Chill\MainBundle\Entity\User;
+use Chill\MainBundle\Export\Messenger\ExportRequestGenerationMessage;
+use Chill\MainBundle\Security\Authorization\SavedExportVoter;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Component\Clock\ClockInterface;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\Messenger\MessageBusInterface;
+use Symfony\Component\Routing\Annotation\Route;
+use Symfony\Component\Security\Core\Security;
+use Symfony\Component\Serializer\SerializerInterface;
+
+class ExportGenerationCreateFromSavedExportController
+{
+    public function __construct(
+        private Security $security,
+        private EntityManagerInterface $entityManager,
+        private MessageBusInterface $messageBus,
+        private ClockInterface $clock,
+        private SerializerInterface $serializer,
+    ) {}
+
+    #[Route('/api/1.0/main/export/export-generation/create-from-saved-export/{id}', methods: ['POST'])]
+    public function __invoke(SavedExport $export): JsonResponse
+    {
+        if (!$this->security->isGranted(SavedExportVoter::GENERATE, $export)) {
+            throw new AccessDeniedHttpException('Not allowed to generate an export from this saved export');
+        }
+        $user = $this->security->getUser();
+
+        if (!$user instanceof User) {
+            throw new AccessDeniedHttpException('Only users can create exports');
+        }
+
+        $exportGeneration = ExportGeneration::fromSavedExport($export, $this->clock->now()->add(new \DateInterval('P6M')));
+
+        $this->entityManager->persist($exportGeneration);
+        $this->entityManager->flush();
+
+        $this->messageBus->dispatch(new ExportRequestGenerationMessage($exportGeneration, $user));
+
+        return new JsonResponse(
+            $this->serializer->serialize($exportGeneration, 'json', ['groups' => ['read']]),
+            json: true,
+        );
+    }
+}