[UR] Skip new command-buffer CTS test on L0 V2 (#17566)
All UR command-buffer CTS tests are marked as XFail on V2 [See CTS
generic base class for
command-buffer](https://github.com/intel/llvm/blob/sycl/unified-runtime/test/conformance/exp_command_buffer/fixtures.h#L48)
This was omitted by accident from the new command-buffer CTS tests added
in https://github.com/intel/llvm/pull/17494 which don't derive from that
base class. Fixed by adding in now.
