Fix configuration of SUSY/Exotics MC21 simulation jobs
Make legacy configuration for the ExtraParticles G4Extension more robust Improved configuration to avoid causing problems in the case of running with other G4Extensions which add new particles. Should fix ATLASSIM-5960
Also, in the CA-based configuration move specialConfig preIncludes after command-line preIncludes in simulation jobs.
This is necessary to maintain agreement between old and new-style configuration when G4GammaGeneralProcess
is activated (as it is by default in MC21).
Closes ATLASSIM-5960