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/Notification.php

@@ -14,7 +14,6 @@ namespace Chill\MainBundle\Entity;
 use Chill\MainBundle\Doctrine\Model\TrackUpdateInterface;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\Common\Collections\Collection;
-use Doctrine\Common\Collections\Order;
 use Doctrine\ORM\Mapping as ORM;
 use Symfony\Component\Validator\Constraints as Assert;
 use Symfony\Component\Validator\Context\ExecutionContextInterface;
@@ -58,7 +57,7 @@ class Notification implements TrackUpdateInterface
      * @var Collection<NotificationComment>
      */
     #[ORM\OneToMany(targetEntity: NotificationComment::class, mappedBy: 'notification', orphanRemoval: true)]
-    #[ORM\OrderBy(['createdAt' => 'ASC'])]
+    #[ORM\OrderBy(['createdAt' => \Doctrine\Common\Collections\Criteria::ASC])]
     private Collection $comments;
 
     #[ORM\Column(type: \Doctrine\DBAL\Types\Types::DATETIME_IMMUTABLE)]