ISTWCMS-7275: Rename UwCblPublicationSearch to UwCblReferencesSearch class

This refactor updates the class name and admin label to better reflect its purpose. It ensures consistency between the class naming and its functionality within the module.

src/Plugin/Block/UwCblPublicationSearch.php → src/Plugin/Block/UwCblReferencesSearch.php

@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
  *   admin_label = @Translation("Reference search"),
  * )
  */
-class UwCblPublicationSearch extends BlockBase implements ContainerFactoryPluginInterface {
+class UwCblReferencesSearch extends BlockBase implements ContainerFactoryPluginInterface {
 
   /**
    * The entity type manager.