fix(cli): Prevent stdout/stderr patching for extension commands (#13600)

Co-authored-by: jacob314 <jacob314@gmail.com>

packages/cli/src/commands/utils.ts

@@ -0,0 +1,12 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { runExitCleanup } from '../utils/cleanup.js';
+
+export async function exitCli(exitCode = 0) {
+  await runExitCleanup();
+  process.exit(exitCode);
+}