Fix RNTester running in the old architecture (facebook#50940)

Summary:
We landed a PR that was importing a file available only in the New Architecture also when the app was running in the old architecture.
This was creating a corrupted bundle for rntester.

This PR fixes the issue

bypass-github-export-checks

## Changelog:
[Internal] - Fix RNTester on Android

Pull Request resolved: facebook#50940

Test Plan: Tested locally by setting `newArchEnabled` to false in the gradle.properties file

Reviewed By: javache, cortinico

Differential Revision: D73663049

Pulled By: cipolleschi

fbshipit-source-id: c8d6e4190adee7388e51901360a811b0007ee3a5

Author: cipolleschi

packages/rn-tester/js/examples/ContentURLAndroid/ContentURLAndroid.js

@@ -22,7 +22,6 @@ import {
   TouchableOpacity,
   View,
 } from 'react-native';
-import NativeSampleTurboModule from 'react-native/Libraries/TurboModule/samples/NativeSampleTurboModule';
 
 function blobToBase64(blob: Blob) {
   return new Promise<string>((resolve, reject) => {
@@ -43,6 +42,8 @@ const ContentSelector = (): React.Node => {
   const [base64Image, setBase64Image] = React.useState('');
   const imageSelector = React.useCallback(async () => {
     try {
+      const NativeSampleTurboModule =
+        require('react-native/Libraries/TurboModule/samples/NativeSampleTurboModule').default;
       const uri = await NativeSampleTurboModule.getImageUrl?.();
       if (uri != null) {
         console.log({uri});