E2E/Playwright: Update dependencies, screenshots, config and type (#23000)

* update dependencies

* update default server config and client type

* close browser context once test is done

* fix test when switching a product

* update screenshots and readme

* add cross-env and make headless mode as default

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/playwright/support/server/client.ts

@@ -1,7 +1,7 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
 
-// This is based on "packages/client/src/client4.ts". Modified for node client.
+// This is based on "webapp/platform/client/src/client4.ts". Modified for node client.
 // Update should be made in comparison with the base Client4.
 
 import fs from 'node:fs';
@@ -134,7 +134,7 @@ export default class Client extends Client4 {
 
     // *****************************************************************************
     // Boards client
-    // based on https://github.com/mattermost/focalboard/blob/main/webapp/src/octoClient.ts
+    // based on "webapp/boards/src/octoClient.ts"
     // *****************************************************************************
 
     async patchUserConfig(userID: string, patch: UserConfigPatch): Promise<UserPreference[] | undefined> {