Add access controls and permissions for signature steps

Implemented a Voter to enforce permissions on signature steps, ensuring only authorized users can sign steps. Updated relevant controllers and templates to reflect these permissions, and added corresponding tests to validate the changes.

src/Bundle/ChillMainBundle/Tests/Controller/WorkflowAddSignatureControllerTest.php

@@ -18,12 +18,14 @@ use Chill\DocStoreBundle\Service\Signature\PDFSignatureZoneAvailable;
 use Chill\MainBundle\Controller\WorkflowAddSignatureController;
 use Chill\MainBundle\Entity\User;
 use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
+use Chill\MainBundle\Security\Authorization\EntityWorkflowStepSignatureVoter;
 use Chill\MainBundle\Workflow\EntityWorkflowManager;
 use Chill\MainBundle\Workflow\WorkflowTransitionContextDTO;
 use Chill\PersonBundle\Entity\Person;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Twig\Environment;
 
@@ -65,7 +67,11 @@ class WorkflowAddSignatureControllerTest extends TestCase
 
         $urlGenerator = $this->createMock(UrlGeneratorInterface::class);
 
-        $controller = new WorkflowAddSignatureController($entityWorkflowManager, $pdfSignatureZoneAvailable, $normalizer, $twig, $urlGenerator);
+        $security = $this->createMock(Security::class);
+        $security->expects($this->once())->method('isGranted')->with(EntityWorkflowStepSignatureVoter::SIGN, $signature)
+            ->willReturn(true);
+
+        $controller = new WorkflowAddSignatureController($entityWorkflowManager, $pdfSignatureZoneAvailable, $normalizer, $twig, $urlGenerator, $security);
 
         $actual = $controller($signature, new Request());