fix: small error in delete validation

The code in current version doesn't work and does nothing with the validation results.

Author: mrossard

core/validation.md

@@ -419,7 +419,11 @@ final readonly class MyEntityRemoveProcessor implements ProcessorInterface
 
     public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = [])
     {
-        $this->validator->validate($data, ['groups' => ['deleteValidation']]);
+        $validationErrors = $this->validator->validate($data, groups: ['deleteValidation']]);
+        if($validationErrors->count() > 0) {
+            //trigger some error / throw some exception...for example
+            throw new ConflictHttpException($errors->get(0)->getMessage());
+        }
         $this->doctrineProcessor->process($data, $operation, $uriVariables, $context);
     }
 }