Update Android CI and Emulator image to API 23 (#194936)
As seen in https://github.com/android/ndk/issues/2188, NDK will raise
minimum supported version to API 23 (Android 6.0) in r31. We need to
bump the API level for the x86 emulator image so we can use it for the
CI. It required generating a new ABI list for API 23 and removing the
old API 21 and making some changes to adb_run.py to filter out warnings
and get permissions for the adb run folder.
