Add cron job for removing expired stored objects

Introduced `RemoveExpiredStoredObjectCronJob` to automate the deletion of expired stored objects every 7 days. Enhanced associated tests and updated relevant interfaces and classes to support the new cron job functionality.

src/Bundle/ChillDocStoreBundle/Repository/StoredObjectRepository.php

@@ -14,6 +14,7 @@ namespace Chill\DocStoreBundle\Repository;
 use Chill\DocStoreBundle\Entity\StoredObject;
 use Doctrine\ORM\EntityManagerInterface;
 use Doctrine\ORM\EntityRepository;
+use Doctrine\ORM\Query;
 
 final readonly class StoredObjectRepository implements StoredObjectRepositoryInterface
 {
@@ -53,6 +54,16 @@ final readonly class StoredObjectRepository implements StoredObjectRepositoryInt
         return $this->repository->findOneBy($criteria);
     }
 
+    public function findByExpired(\DateTimeImmutable $expiredAtDate): iterable
+    {
+        $qb = $this->repository->createQueryBuilder('stored_object');
+        $qb
+            ->where('stored_object.deleteAt <= :expiredAt')
+            ->setParameter('expiredAt', $expiredAtDate);
+
+        return $qb->getQuery()->toIterable(hydrationMode: Query::HYDRATE_OBJECT);
+    }
+
     public function getClassName(): string
     {
         return StoredObject::class;

src/Bundle/ChillDocStoreBundle/Repository/StoredObjectRepositoryInterface.php

@@ -17,4 +17,10 @@ use Doctrine\Persistence\ObjectRepository;
 /**
  * @extends ObjectRepository<StoredObject>
  */
-interface StoredObjectRepositoryInterface extends ObjectRepository {}
+interface StoredObjectRepositoryInterface extends ObjectRepository
+{
+    /**
+     * @return iterable<StoredObject>
+     */
+    public function findByExpired(\DateTimeImmutable $expiredAtDate): iterable;
+}