Refactored code to use PHP8 attributes instead of annotations

In this change, Doctrine and validation annotations have been replaced with PHP8 Attributes. The Rector tool has been configured with a list of annotations to convert to attributes. As a consequence, the PHPStan's rules have been updated to reflect these changes. The PHP8's nullable operator (?) has been added where required, and comments in field declaration have been replaced with #[Attribute] syntax.

src/Bundle/ChillMainBundle/Entity/Workflow/EntityWorkflow.php

@@ -24,12 +24,10 @@ use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Serializer\Annotation as Serializer;
 use Symfony\Component\Validator\Constraints as Assert;
 
-/**
- * @EntityWorkflowCreation(groups={"creation"})
- */
 #[Serializer\DiscriminatorMap(typeProperty: 'type', mapping: ['entity_workflow' => EntityWorkflow::class])]
 #[ORM\Entity]
 #[ORM\Table('chill_main_workflow_entity')]
+#[EntityWorkflowCreation(groups: ['creation'])]
 class EntityWorkflow implements TrackCreationInterface, TrackUpdateInterface
 {
     use TrackCreationTrait;