feat: convert code storage test to Playwright (#54662)

e2e/code-storage.spec.ts

@@ -0,0 +1,26 @@
+import { test, expect } from '@playwright/test';
+test.use({ storageState: 'playwright/.auth/certified-user.json' });
+test.describe('Challenge with editor', function () {
+  test('the shortcut "Ctrl + S" saves the code', async ({ page }) => {
+    await page.goto(
+      '/learn/2022/responsive-web-design/learn-html-by-building-a-cat-photo-app/step-2'
+    );
+
+    const editor = page.locator('textarea');
+
+    await editor.fill('Something funny');
+    await page.keyboard.down('Control');
+    await page.keyboard.press('S');
+
+    await expect(
+      page.getByText(
+        "Saved! Your code was saved to your browser's local storage."
+      )
+    ).toBeVisible();
+
+    await page.reload();
+
+    // check editor content
+    await expect(editor).toHaveValue(/Something funny/);
+  });
+});