Convert from Webpack to Vite (#34450)

Co-authored-by: Renaud Chaput <renchap@gmail.com>

app/javascript/mastodon/polyfills/index.ts

@@ -2,10 +2,13 @@
 // If there are no polyfills, then this is just Promise.resolve() which means
 // it will execute in the same tick of the event loop (i.e. near-instant).
 
+// eslint-disable-next-line import/extensions -- This file is virtual so it thinks it has an extension
+import 'vite/modulepreload-polyfill';
+
 import { loadIntlPolyfills } from './intl';
 
 function importExtraPolyfills() {
-  return import(/* webpackChunkName: "extra_polyfills" */ './extra_polyfills');
+  return import('./extra_polyfills');
 }
 
 export function loadPolyfills() {