fix: Fix storybook (no-changelog) (#4624)

since we migrated to vite, storybook/webpack aren't doing all the babel transforms. that's we we need to revert all optional-chaining and nullish-coalescing in design-system.

Hopefully this will be remedied after we move to vite for storybook.

packages/design-system/src/components/N8nNotice/Notice.vue

@@ -74,7 +74,7 @@ export default Vue.extend({
 
 			if (event.target.localName !== 'a') return;
 
-			if (event.target.dataset?.key) {
+			if (event.target.dataset && event.target.dataset.key) {
 				event.stopPropagation();
 				event.preventDefault();