Add protection against building FastCaloSim G4VFastSimulationModel in AthSimulation builds
As AthSimulation is not build as part of the 22.0 CI pipeline, we missed that !54881 (merged) added some unsupported dependencies to the AthSimulation build. This merge request patches the Simulation/G4Utilities/G4FastSimulation
package, so that it avoids compiling the new classes in AthSimulation builds.
This should fix ATLASSIM-5962, ATLASSIM-5963, ATLASSIM-5964, ATLASSIM-5965.