Fix RNTester networking conversion to TurboModule (#27218)
Fix RNTester networking conversion to TurboModule (#27218)

Summary:
Now that the networking module is a TurboModule request handlers need to be passed at module creation. The code was missing for RNTester.

## Changelog

[Internal] [Fixed] - Fix RNTester networking conversion to TurboModule
Pull Request resolved: https://github.com/facebook/react-native/pull/27218

Test Plan: Tested that RNTester XMLHttpRequest example now works on iOS

Differential Revision: D18506038

Pulled By: RSNara

fbshipit-source-id: cd88319e386c7b7b6e11cfb920f2ceb761a4136a

hoangpham95/react-native,arthuralee/react-native,javache/react-native,janicduplessis/react-native,javache/react-native,myntra/react-native,arthuralee/react-native,hoangpham95/react-native,myntra/react-native,hammerandchisel/react-native,javache/react-native,facebook/react-native,myntra/react-native,hammerandchisel/react-native,pandiaraj44/react-native,facebook/react-native,javache/react-native,exponent/react-native,exponent/react-native,facebook/react-native,exponent/react-native,exponentjs/react-native,facebook/react-native,pandiaraj44/react-native,exponent/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,pandiaraj44/react-native,janicduplessis/react-native,exponent/react-native,pandiaraj44/react-native,pandiaraj44/react-native,hoangpham95/react-native,exponentjs/react-native,janicduplessis/react-native,myntra/react-native,exponent/react-native,exponentjs/react-native,hoangpham95/react-native,hammerandchisel/react-native,hammerandchisel/react-native,facebook/react-native,myntra/react-native,myntra/react-native,hoangpham95/react-native,janicduplessis/react-native,hoangpham95/react-native,janicduplessis/react-native,facebook/react-native,hammerandchisel/react-native,javache/react-native,javache/react-native,exponent/react-native,exponentjs/react-native,hoangpham95/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,pandiaraj44/react-native,hammerandchisel/react-native,pandiaraj44/react-native,myntra/react-native,myntra/react-native,exponentjs/react-native,arthuralee/react-native,exponentjs/react-native,arthuralee/react-native,myntra/react-native,arthuralee/react-native,exponentjs/react-native,hammerandchisel/react-native,exponentjs/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,exponent/react-native,javache/react-native,hoangpham95/react-native,hammerandchisel/react-native