Download updated multi-arch prebuilt bootctl binaries built from
Android 14 (android-14.0.0_r1) and package them into jniLibs alongside
busybox instead of bundling a single binary in assets.
The new bootctl binaries support AIDL Boot HAL implementations on
Android 14+ (API 31+), fixing OTA slot switching issues on newer
devices like Pixels.
Update post-OTA install logic in the app and shell scripts to use the
native bootctl executable from MAGISKBIN.
Fixes#8824
topjohnwu