Fix Android instrumentation tests in CI

[thunderbiscuit]

The CI should run the instrumented tests.

[thunderbiscuit]

Running tests in the emulator on CI is currently creating some issues for us because

1. Ubuntu images are notorious for not working well with emulators
2. Connected Android tests should usually be run on macOS images, but the NDK version we're using is now deprecated on all GitHub macOS images, and so it needs to be added manually, but for some reason this is throwing errors.

I have opened a PR to fix this (#282) but over the course of my research on the issue I have come to the conclusion that we might be creating our own problem here by using such an old version of the NDK. The latest LTS version is r25c and we're on 21. Looking into whether we might be able to update to the NDK maintained in the GitHub macOS latest image, which would be 25.1.8937393.

[thunderbiscuit]

Something about the ring library creating problems when updating to a different NDK.

Links: briansmith/ring#486

Error:

warning: In file included from <built-in>:382:
warning: <command line>:2:9: warning: '__ANDROID_API__' macro redefined [-Wmacro-redefined]
warning: #define __ANDROID_API__ 21
warning:         ^
warning: <built-in>:376:9: note: previous definition is here
warning: #define __ANDROID_API__ __ANDROID_MIN_SDK_VERSION__
warning:         ^

[thunderbiscuit]

I tried to update the NDK to the minimum version that ships on the macos-12 image (23.2.8568313). No dice.