v1.40.0

## Test Generator Update

![Playwright Test Generator](https://github.com/microsoft/playwright/assets/9881434/e8d67e2e-f36d-4301-8631-023948d3e190)

New tools to generate assertions:
- "Assert visibility" tool generates [expect(locator).toBeVisible()](https://playwright.dev/docs/api/class-locatorassertions#locator-assertions-to-be-visible).
- "Assert value" tool generates [expect(locator).toHaveValue(value)](https://playwright.dev/docs/api/class-locatorassertions#locator-assertions-to-have-value).
- "Assert text" tool generates [expect(locator).toContainText(text)](https://playwright.dev/docs/api/class-locatorassertions#locator-assertions-to-contain-text).

Here is an example of a generated test with assertions:

```js
import { test, expect } from '@playwright/test';

test('test', async ({ page }) => {
  await page.goto('https://playwright.dev/');
  await page.getByRole('link', { name: 'Get started' }).click();
  await expect(page.getByLabel('Breadcrumbs').getByRole('list')).toContainText('Installation');
  await expect(page.getByLabel('Search')).toBeVisible();
  await page.getByLabel('Search').click();
  await page.getByPlaceholder('Search docs').fill('locator');
  await expect(page.getByPlaceholder('Search docs')).toHaveValue('locator');
});
```

## New APIs
- Option `reason` in [page.close()](https://playwright.dev/docs/api/class-page#page-close), [browserContext.close()](https://playwright.dev/docs/api/class-browsercontext#browser-context-close) and [browser.close()](https://playwright.dev/docs/api/class-browser#browser-close). Close reason is reported for all operations interrupted by the closure.
- Option `firefoxUserPrefs` in [browserType.launchPersistentContext(userDataDir)](https://playwright.dev/docs/api/class-browsertype#browser-type-launch-persistent-context).

## Other Changes
- Methods [download.path()](https://playwright.dev/docs/api/class-download#download-path) and [download.createReadStream()](https://playwright.dev/docs/api/class-download#download-create-read-stream) throw an error for failed and cancelled downloads.
- Playwright [docker image](https://playwright.dev/docs/docker) now comes with Node.js v20.

## Browser Versions
* Chromium 120.0.6099.28
* Mozilla Firefox 119.0
* WebKit 17.4

This version was also tested against the following stable channels:
* Google Chrome 119
* Microsoft Edge 119