[mobile/reactnative] Remove namespace from AndroidManifest.XML to resolve warning (microsoft#23847)

### Description
Removes namespace from AndroidManifest.XML



### Motivation and Context
- Resolves microsoft#21681

Author: carzh

js/react_native/android/src/main/AndroidManifest.xml

@@ -1,3 +1,2 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-          package="ai.onnxruntime.reactnative">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 </manifest>