Guarantee physics stability through Geant4 versions

Guarantee physics stability through Geant4 versions (a.k.a The importance of having a stable physics) have the possibility to disentangle updates to the physics to updates to the rest of Geant4. In other words have the possibility to adopt new version of Geant4 keeping the physics stable

Voiced by ATLAS; Contacts: Walter Hopkins, Jana Schaardschmidt, Marilena Bandieramonte

See p.11 of Marilena's talk: https://indico.cern.ch/event/1455551/contributions/6139451/attachments/2941438/5167964/20241007_OpenAndNewRequirementsHeP_MBandieramonte.pdf