Allow DIDType.X output style from rucio
This MR makes a minor adaptation to PrunDriver to accept the rucio output style where a DIDType is explicitly listed as DIDType.X (e.g. CONTAINER appears as DIDType.CONTAINER). It's the same issue targeted by !49537 (merged), but that one did not touch PrunDriver. The change will allow "retrieve" to work with the new output style (and still also the old one).
It's maybe worth mentioning that I made the same MR about a year ago, !40180 (closed), but at that time we were told that the output change was a temporary bug. I am not sure if that's also the case now, but in any case it seems useful to accept the output style if it's a regularly occurring bug...