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Add new G4FastCaloTest simulator configuration

John Derek Chapman requested to merge jchapman/athena:ExtraSimSelectorsG4FastCalo_21.0 into 21.0

G4FastCaloTest is the same as G4FastCalo except that charged pions below 200 MeV and protons, KLong and K+- below 750 MeV entering the Calorimeter are handled by Geant4.

This will be used to check the (physics and CPU) performance impact of using Geant4 to simulate these lower energy particles.

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