Fix locationCount: use repository count query instead of lazy collection

getComponentPositions() returns a Doctrine PersistentCollection that can
be stale after a within-scenario clear(). A direct COUNT query via the
repository is always accurate regardless of identity map state.

Author: silverbackdan

features/bootstrap/DoctrineContext.php

@@ -1585,5 +1585,6 @@ public function thereIsAPublishedDummyPublishableComponentInPositions(int $count
         }
 
         $this->manager->flush();
+        $this->manager->clear();
     }
 }

src/Serializer/Normalizer/PublishableNormalizer.php

@@ -18,6 +18,7 @@
 use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\Persistence\ManagerRegistry;
 use Doctrine\Persistence\ObjectManager;
+use Silverback\ApiComponentsBundle\Entity\Core\ComponentPosition;
 use Silverback\ApiComponentsBundle\Annotation\Publishable;
 use Silverback\ApiComponentsBundle\Event\ResourceChangedEvent;
 use Silverback\ApiComponentsBundle\Exception\InvalidArgumentException;
@@ -76,7 +77,9 @@ public function normalize($object, $format = null, array $context = []): float|a
         }
 
         $isPublished = $this->publishableStatusChecker->isActivePublishedAt($object);
-        $locationCount = method_exists($object, 'getComponentPositions') ? count($object->getComponentPositions()) : null;
+        $locationCount = method_exists($object, 'getComponentPositions')
+            ? $this->registry->getManagerForClass(ComponentPosition::class)?->getRepository(ComponentPosition::class)->count(['component' => $object])
+            : null;
 
         $resourceMetadata = $this->resourceMetadataProvider->findResourceMetadata($object);
         $resourceMetadata->setPublishable($isPublished, null, $locationCount);