Ensure that all uploaded builds have at least 64 bits
Modified name of jobs running one one arch. This is simplified in CI to emphasize on the Arch and not the app type (as in reality "win32" apps can be built in 64 bits...)
In CI :
win32 = 32bits
win64 = 64bits
win3264 = multiarch 32/64 bits
Now run vs2022-ninja-win64-windows both in mr and nightly, to be able to run tests
Re-enabled Nightly Xamarin