lump Playwright tests about nav in different viewports (#37121)

tests/rendering-fixtures/playwright-rendering.spec.ts

@@ -221,6 +221,7 @@ test('hovercards', async ({ page }) => {
   await expect(page.getByText("This page doesn't really have an intro")).toBeVisible()
 })
 
+test.describe('test nav at different viewports', () => {
   test('x-large viewports - 1280+', async ({ page }) => {
     page.setViewportSize({
       width: 1300,
@@ -351,6 +352,7 @@ test('small viewports - 544-767', async ({ page }) => {
     await page.getByTestId('sidebar-hamburger').click()
     await expect(page.getByTestId('sidebar-product-dialog')).toBeVisible()
   })
+})
 
 test.describe('survey', () => {
   test('happy path, thumbs up and enter email', async ({ page }) => {