MM-63669 E2E/Playwright: Move "e2e-tests/playwright/test" to "e2e-tests/playwright" folder (#30647)

* move "e2e-tests/playwright/test" to  "e2e-tests/playwright/test" and expose "ensurePluginsLoaded"

* add test setup, and expose ensurePluginsLoaded and ensureServerDeployment to pw

e2e-tests/playwright/specs/functional/system_console/desktop_landing.spec.ts

@@ -0,0 +1,51 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {Page} from '@playwright/test';
+
+import {expect, test} from '@mattermost/playwright-lib';
+
+// Helper function to intercept API request and modify the response
+async function interceptConfigWithLandingPage(page: Page, enabled: boolean) {
+    const apiUrl = '**/api/v4/config/client?format=old**';
+    await page.route(apiUrl, (route) => {
+        route.fulfill({
+            status: 200,
+            body: JSON.stringify({
+                EnableDesktopLandingPage: enabled,
+                EnableSignInWithUsername: 'true',
+            }),
+            headers: {'Content-Type': 'application/json'},
+        });
+    });
+}
+
+test('MM-T5640_1 should not see landing page ', async ({pw, page}) => {
+    await interceptConfigWithLandingPage(page, false);
+
+    // Navigate to your starting URL
+    await page.goto('/');
+
+    // Wait until the URL contains '/login'
+    await page.waitForURL(/.*\/login.*/);
+
+    // At this point, the URL should contain '/login'
+    expect(page.url()).toContain('/login');
+
+    // Verify the login page is visible
+    await pw.loginPage.toBeVisible();
+});
+
+test('MM-T5640_2 should see landing page', async ({pw, page}) => {
+    // Navigate to your starting URL
+    await page.goto('/');
+
+    // Wait until the URL contains '/landing'
+    await page.waitForURL(/.*\/landing.*/, {timeout: pw.duration.ten_sec});
+
+    // At this point, the URL should contain '/landing'
+    expect(page.url()).toContain('/landing');
+
+    // Verify the landing page is visible
+    await pw.landingLoginPage.toBeVisible();
+});