Update BeamPipe Section volume names
It was noticed in ATLASSIM-3773 that the names of beampipe sections changed between Run1 and Run2 geometries. Various G4PhysicsRegions were configured using the Run1 beampipe section names. This merge request attempts to correctly configure the section names for Run2/3/4 geometries (which currently all use the same section names).
Edited by John Derek Chapman