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

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

e2e-tests/playwright/test.config.ts

@@ -55,7 +55,7 @@ const config: TestConfig = {
     // CI
     isCI: !!process.env.CI,
     // Playwright
-    headless: parseBool(process.env.PW_HEADLESS, false),
+    headless: parseBool(process.env.PW_HEADLESS, true),
     slowMo: parseNumber(process.env.PW_SLOWMO, 0),
     workers: parseNumber(process.env.PW_WORKERS, 1),
     // Visual tests