Fix(noninteractive) - Add message when user uses deprecated flag (#11682)

Co-authored-by: gemini-cli-robot <gemini-cli-robot@google.com>

packages/cli/src/gemini.test.tsx

@@ -439,6 +439,7 @@ describe('startInteractiveUI', () => {
   vi.mock('./utils/cleanup.js', () => ({
     cleanupCheckpoints: vi.fn(() => Promise.resolve()),
     registerCleanup: vi.fn(),
+    runExitCleanup: vi.fn(),
   }));
 
   vi.mock('ink', () => ({