Microsoft has open sourced the GDK: https://github.com/microsoft/gdk

Using the MIT-licensed code from that repo, we could have sentry-native support the GDK on PC and make it easier for folks on Xbox to build on top of that to get access to closed-source/NDA protected platforms (i.e: Xbox Series S|X)

Testing must be done only with the Windows GDK. To be clear, only code from the open source GDK (https://github.com/microsoft/gdk) can be used here and CI won't involve devices other than the GHA Windows VM.

General references to the Xbox Extensions is OK btw, we just can't have any code from it here. So if that helps with the CMake files, that's fine.