[ngocle2497]

Overview

On Prev-PR, we used script to change AndroidManifest content.
Now we create new AndroidManifest file, then use this when android support namespace

Test Plan

[TantiE100]

A concrete case where the build-time manifest rewrite this PR removes causes trouble, in case it helps to get it merged.

android/build.gradle rewrites src/main/AndroidManifest.xml inside node_modules on every Gradle configuration (with AGP 7+ it strips package=). @react-native-masked-view/masked-view 0.3.2 is a dependency of expo-router, and Expo's fingerprint (runtimeVersion: { policy: 'fingerprint' }) hashes that file. So any local expo run:android changes the project fingerprint: the local runtime stops matching the one on EAS and on the store build, and OTA updates published from that checkout target a runtime no installed build has. We hit it twice before tracking it down; the workaround was npm ci before every fingerprint check.

We now ship the same idea as this PR as a local patch on 0.3.2: the manifest without package= (what the script left anyway on AGP 8) and namespace declared unconditionally, since React Native 0.73+ requires AGP 8. The merged manifest is identical, and building no longer modifies node_modules.

Would be great to see this (or just dropping the rewrite for AGP ≥ 7.3) in a release.