API Remove CMSEditLink implementation, rely on superclass instead.

code/Model/SiteTree.php

@@ -285,7 +285,6 @@ class SiteTree extends DataObject implements PermissionProvider, i18nEntityProvi
         'Link' => 'Text',
         'RelativeLink' => 'Text',
         'AbsoluteLink' => 'Text',
-        'CMSEditLink' => 'Text',
         'TreeTitle' => 'HTMLFragment',
         'MetaTags' => 'HTMLFragment',
     ];
@@ -758,20 +757,6 @@ public function getAbsoluteLiveLink($includeStageEqualsLive = true)
         return $link;
     }
 
-    /**
-     * Generates a link to edit this page in the CMS.
-     *
-     * Implemented here to satisfy the CMSPreviewable interface, but data is intended to be loaded via Extension
-     *
-     * @see SilverStripe\Admin\CMSEditLinkExtension
-     *
-     * @return string
-     */
-    public function CMSEditLink()
-    {
-        return $this->extend('CMSEditLink')[0] ?? '';
-    }
-
     /**
      * Return a CSS identifier generated from this page's link.
      *