fix(headless commerce SSR): expose promoteChildToParent method on SSR ProductList type (#4798)

https://coveord.atlassian.net/browse/KIT-3810

Author: fbeaudoincoveo

Diff for: packages/headless/src/controllers/commerce/product-list/headless-product-list.ssr.ts

@@ -13,7 +13,7 @@ import {buildSearch, Search} from '../search/headless-search.js';
 export type {ProductListingState as ProductListState} from '../product-listing/headless-product-listing.js';
 export type ProductList = Pick<
   ProductListing | Search,
-  'state' | 'subscribe' | 'interactiveProduct'
+  'state' | 'subscribe' | 'interactiveProduct' | 'promoteChildToParent'
 >;
 
 /**