Don't use G4* environment varaibles in the hadronic tests (See LHCBGAUSS-739)

See LHCBGAUSS-739. We can use a slot name for the plot names in lhcbpr instead of putting Geant version into the plots

Changed title: Lhcbgauss 739 → {+Don't use G4 environment varaibles in the hadronic tests (See LHCBGAUSS-739)+}*

Status changed to merged

mentioned in commit e7569bba