Fix: re-add Serializer discriminator map to Motive entity

- Enabled `type` property discrimination for serialization with `DiscriminatorMap`.
- Prepared `Motive` entity for serialization of motive types.

src/Bundle/ChillTicketBundle/src/Entity/Motive.php

@@ -17,9 +17,11 @@ use Doctrine\Common\Collections\Collection;
 use Doctrine\Common\Collections\ReadableCollection;
 use Doctrine\Common\Collections\Selectable;
 use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Annotation as Serializer;
 
 #[ORM\Entity()]
 #[ORM\Table(name: 'motive', schema: 'chill_ticket')]
+#[Serializer\DiscriminatorMap(typeProperty: 'type', mapping: ['ticket_motive' => Motive::class])]
 class Motive
 {
     #[ORM\Id]