test: re-enable localize warning check

It can be re-enabled now that angular/angular#56300 have been released in v18.1.0-next.2

tests/legacy-cli/e2e/tests/i18n/extract-ivy.ts

@@ -1,7 +1,7 @@
 import { join } from 'path';
 import { getGlobalVariable } from '../../utils/env';
 import { expectFileToMatch, writeFile } from '../../utils/fs';
-import { installPackage, uninstallPackage } from '../../utils/packages';
+import { uninstallPackage } from '../../utils/packages';
 import { ng } from '../../utils/process';
 import { expectToFail } from '../../utils/utils';
 import { readNgVersion } from '../../utils/version';
@@ -38,13 +38,12 @@ export default async function () {
   if (getGlobalVariable('argv')['ng-snapshots']) {
     localizeVersion = require('../../ng-snapshot/package.json').dependencies['@angular/localize'];
   }
-  await installPackage(localizeVersion);
+  await ng('add', `@angular/localize@${localizeVersion}`, '--skip-confirmation');
 
   // Should not show any warnings when extracting
   const { stderr: message5 } = await ng('extract-i18n');
   if (message5.includes('WARNING')) {
-    // TODO: enable once https://github.com/angular/angular/pull/56300 is released.
-    // throw new Error('Expected no warnings to be shown. STDERR:\n' + message5);
+    throw new Error('Expected no warnings to be shown. STDERR:\n' + message5);
   }
 
   await expectFileToMatch('messages.xlf', 'Hello world');