Merge branch 'master-simulation-run3G4Optimizations' into 'master'

Change Neutron Russian Roulette threshold from 1 to 2 MeV - value used in phys validation

See merge request atlas/athena!41524

Simulation/SimulationJobOptions/share/g4/preInclude.Run3G4Optimiziations.py

@@ -44,7 +44,7 @@ else:
 #
 #########################################################
 
-nrr_threshold = 1. # MeV
+nrr_threshold = 2. # MeV
 nrr_weight = 10.
 
 from G4AtlasApps.SimFlags import simFlags