feat: add after_refresh hook to item dashboard (frappe#33372)

* fix: return promise

* fix: use after_refresh hook instead of promise

# Because there is already a before_refresh hook. I think it makes sense to do the same for after.

erpnext/stock/dashboard/item_dashboard.js

@@ -102,6 +102,9 @@ erpnext.stock.ItemDashboard = class ItemDashboard {
 			args: args,
 			callback: function (r) {
 				me.render(r.message);
+				if(me.after_refresh) {
+					me.after_refresh();
+				}
 			}
 		});
 	}