Remove obsolete metadata fields from version tables

Signed-off-by: Tim Goudriaan <tim@codedmonkey.com>

Author: codedmonkey

migrations/Version20260120114538.php

@@ -3,8 +3,6 @@
 namespace CodedMonkey\Dirigent\Doctrine\Entity;
 
 use CodedMonkey\Dirigent\Doctrine\Repository\KeywordRepository;
-use Doctrine\Common\Collections\ArrayCollection;
-use Doctrine\Common\Collections\Collection;
 use Doctrine\ORM\Mapping as ORM;
 
 #[ORM\Entity(repositoryClass: KeywordRepository::class)]
@@ -19,13 +17,9 @@ class Keyword
     #[ORM\Column(length: 191)]
     private string $name;
 
-    #[ORM\ManyToMany(targetEntity: Version::class, mappedBy: 'keywords')]
-    protected Collection $versions;
-
     public function __construct(string $name)
     {
         $this->name = $name;
-        $this->versions = new ArrayCollection();
     }
 
     public function getId(): ?int