Properly setup MuonIdHelperSvc in TPCnvTest to avoid warnings
Hi, this MR adds an explicit setup of the MuonIdHelperSvc inside TPCnvTest to suppress warnings like
MuonIdHelperSvc WARNING Cannot retrieve sTgcIdHelper, please consider setting HasSTgc property to false in the future when running a layout without sTGC chambers
At the same time, it moves to Gaudi::Property for the MuonIdHelperSvc. This is a fix for !27340 (comment 2921152) Best, Nico