JS refactors (#22227)

- Replace all default exports with named exports, except for Vue SFCs
- Remove names from Vue SFCs, they are automatically inferred from the
filename
- Misc whitespace-related tweaks

web_src/js/features/repo-migration.js

@@ -10,7 +10,7 @@ const $lfsSettings = $('#lfs_settings');
 const $lfsEndpoint = $('#lfs_endpoint');
 const $items = $('#migrate_items').find('input[type=checkbox]');
 
-export default function initRepoMigration() {
+export function initRepoMigration() {
   checkAuth();
   setLFSSettingsVisibility();