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/global_setup.ts

@@ -0,0 +1,22 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {baseGlobalSetup, testConfig} from '@mattermost/playwright-lib';
+
+async function globalSetup() {
+    try {
+        await baseGlobalSetup();
+    } catch (error: unknown) {
+        // eslint-disable-next-line no-console
+        console.error(error);
+        throw new Error(
+            `Global setup failed.\n\tEnsure the server at ${testConfig.baseURL} is running and accessible.\n\tPlease check the logs for more details.`,
+        );
+    }
+
+    return function () {
+        // placeholder for teardown setup
+    };
+}
+
+export default globalSetup;