Issue #3486267 by g4mbini: Change ID props to identifier

Closes #3486267

components/accordion_item/accordion_item.component.yml

@@ -35,4 +35,4 @@ props:
     item_id:
       title: ID
       description: 'Must start with a letter. Randomly generated if empty.'
-      type: string
+      $ref: 'ui-patterns://identifier'