Attempt to fix test_android by adding a react-native.config.js inside rn-tester

[cortinico]

Summary

test_android is now red because I had to specify a root for RN tester.
The job is now failing as it fails to find the correct platforms for the bundler command.
This PR fixes it.

Changelog

[Internal] - Attempt to fix test_android by moving react-native.config.js

Test Plan

Tested locally + will wait for a CI result

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,782,661	+18
android	hermes	armeabi-v7a	7,186,066	+6
android	hermes	x86	8,094,112	+7
android	hermes	x86_64	8,071,786	-4
android	jsc	arm64-v8a	9,656,072	+7
android	jsc	armeabi-v7a	8,428,329	+9
android	jsc	x86	9,608,310	+5
android	jsc	x86_64	10,202,934	-4

Base commit: 406a474
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 406a474
Branch: main

[react-native-bot]

This pull request was successfully merged by @cortinico in 1ee7a0a.

^{When will my fix make it into a release? | Upcoming Releases}