Fix: remove package attributes for AndroidManifest.xml

[suzp1984]

Fix warning and Recommendation when ./build.sh -p android -i release

> Task :filament-android:processReleaseManifest
package="com.google.android.filament" found in source AndroidManifest.xml: /Users/jacobsu/hack/graphics/filament/android/filament-android/src/main/AndroidManifest.xml.
Setting the namespace via the package attribute in the source AndroidManifest.xml is no longer supported, and the value is ignored.
Recommendation: remove package="com.google.android.filament" from the source AndroidManifest.xml: /Users/jacobsu/hack/graphics/filament/android/filament-android/src/main/AndroidManifest.xml.

> Task :filament-utils-android:processReleaseManifest
package="com.google.android.filament.utils" found in source AndroidManifest.xml: /Users/jacobsu/hack/graphics/filament/android/filament-utils-android/src/main/AndroidManifest.xml.
Setting the namespace via the package attribute in the source AndroidManifest.xml is no longer supported, and the value is ignored.
Recommendation: remove package="com.google.android.filament.utils" from the source AndroidManifest.xml: /Users/jacobsu/hack/graphics/filament/android/filament-utils-android/src/main/AndroidManifest.xml.

The Android package name is configured in android/filament-utils-android/build.gradle & android/filamat-android/build.gradle's android.namespace property, no-longer inside the AndroidManifest.xml.

[romainguy]

Unfortunately this is not something we can/want to fix right now for reasons internal to Google.