Summary:
This PR is trying to improve Android Network Security configuration introduced in 84572c4051. I found that Android merges all manifest files into a single manifest file when building an app, so this PR provides AndroidManifest.xml with network security config in debug folder, that will be used only for debug builds. Also the network security configuration will be applied to only app that target API 28. Moved security config file to xml-v28, so that it'll only visible to API 28 and above.
See https://developer.android.com/studio/build/manifest-merge
[Android] [Changed] - Android Network Security configuration.
Pull Request resolved: https://github.com/facebook/react-native/pull/23429
Differential Revision: D14065124
Pulled By: cpojer
fbshipit-source-id: 0f5ac5addbe968ed7e5cb57f356e2572de2690a8