Comments out sample React test code

Temporarily disables default test to prevent it from running,
likely in preparation for custom tests or to avoid irrelevant
test failures during development.

src/App.test.js

@@ -1,8 +1,8 @@
-import { render, screen } from '@testing-library/react';
-import App from './App';
+// import { render, screen } from '@testing-library/react';
+// import App from './App';
 
-test('renders learn react link', () => {
-  render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
-});
+// test('renders learn react link', () => {
+//   render(<App />);
+//   const linkElement = screen.getByText(/learn react/i);
+//   expect(linkElement).toBeInTheDocument();
+// });