Use proper way of overriding doctrine attributes

In older versions doctrine allowed overriding attributes, by simply redifining them in subclasses. In 2.16 this throws an exception. We now use the proper way using the AttributeOverrides attribute

src/Entity/Attachments/Attachment.php

@@ -97,7 +97,6 @@ abstract class Attachment extends AbstractNamedDBElement
      */
     #[Assert\NotBlank(message: 'validator.attachment.name_not_blank')]
     #[Groups(['simple', 'extended', 'full'])]
-    #[ORM\Column(type: Types::STRING)]
     protected string $name = '';
 
     /**