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Update ISF_MainConfig.py: ATLFASTIIF_G4MS configuration

Vincent Pascuzzirequested to merge
vpascuzz/athena:harmonize.AFIIF_G4MS.config into 21.3
  • Let Fatras handle muons in the calorimeters when Fatras is used for simulations in Inner Detector
  • Use ISF_DefaultFastCaloSimSelector for calorimeters

This addresses some discrepancies seen in comparisons of observables between ATLFASTII(the current benchmark simulator for fastsim) and ATLFASTIIF_G4MS (Fatras in ID + legacy FastCaloSim + Geant4 in MS) simulations.

Closes ATLASSIM-4566

Edited by Vincent Pascuzzi

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