CLD-8395 Integrate playwright into E2E tests (#28492)

* Finalize Playwright E2E scripts integration, add videos
* Add suggestion by Saturn

Co-authored-by: Saturnino Abril <5334504+saturninoabril@users.noreply.github.com>

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Saturnino Abril <5334504+saturninoabril@users.noreply.github.com>

e2e-tests/playwright/playwright.config.ts

@@ -6,12 +6,12 @@ import {defineConfig, devices} from '@playwright/test';
 import {duration} from '@e2e-support/util';
 import testConfig from '@e2e-test.config';
 
-const defaultOutputFolder = './playwright-report';
+const defaultOutputFolder = './results';
 
 export default defineConfig({
     globalSetup: require.resolve('./global_setup'),
     forbidOnly: testConfig.isCI,
-    outputDir: './test-results',
+    outputDir: './results/tests',
     testDir: 'tests',
     timeout: duration.one_min,
     workers: testConfig.workers,
@@ -40,7 +40,7 @@ export default defineConfig({
         screenshot: 'only-on-failure',
         timezoneId: 'America/Los_Angeles',
         trace: 'off',
-        video: 'on-first-retry',
+        video: 'retain-on-failure',
         actionTimeout: duration.half_min,
         storageState: {
             cookies: [],