Adapt VeraCrypt automated test scenarios vs GNOME automounting
Since enabling automounting (#15900 (closed)) of encrypted media (#15767 (closed)) GNOME will automatically try to unlock plugged VeraCrypt devices. So far we are basically working around that by just cancelling the prompt and using VeraCrypt mounter or GNOME disks (7e126bb9) so we are not testing what users most likely will do, which is not good.
We should at least add VeraCrypt scenarios for using GNOME's automount prompt, maybe completely replacing the VeraCrypt scenarios patched in 7e126bb9.
Details: #20155 (comment 225490)