fix: eager-load mostRelevantPost.user.groups on discussion index

During fulltext search the index populates mostRelevantPost.user, whose
isAdmin() check would otherwise lazy-load groups per discussion.

Author: imorland

framework/core/src/Api/Resource/DiscussionResource.php

@@ -104,7 +104,7 @@ public function endpoints(): array
                     'mostRelevantPost.user'
                 ])
                 ->defaultSort('-lastPostedAt')
-                ->eagerLoad(['state', 'user.groups', 'lastPostedUser.groups'])
+                ->eagerLoad(['state', 'user.groups', 'lastPostedUser.groups', 'mostRelevantPost.user.groups'])
                 ->paginate(),
         ];
     }