Introduce CI checks for binaries in our NDK release AAR

[supervacuus]

Since we now have a binary release channel, we should introduce checks regarding exported symbol stability (we have a linker-script for libsentry.so but not for libsentry-android.so, etc.) and similar issues that could break usage.

These should run on any push to ensure changes to build scripts are immediately (i.e., in the PR and not during release/publish) highlighted as breaking.

The trigger for this is unexpected binaries that the prefab build seemingly adds to the release artifact: #996

This relates slightly to #997 regarding where to introduce the check and how to run it.