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Fix T_AnalysisConfigR3_Tier0.h for HepMC3 builds

John Derek Chapman requested to merge jchapman/athena:PatchTrigInDetAnalysisExample_22.0 into 22.0

Avoid using HepMC2-specific types in T_AnalysisConfigR3_Tier0.h so that it also compiles in HepMC3-based builds.

See for the HepMC3 version of the method:
https://gitlab.cern.ch/atlas/athena/-/blob/master/Generators/AtlasHepMC/AtlasHepMC/GenEvent.h#L50 and here for the HepMC2 version: https://gitlab.cern.ch/atlas/athena/-/blob/master/Generators/AtlasHepMC/AtlasHepMC/GenEvent.h#L197 Preferred auto over #ifdef HEPMC3 ... #else ... #endif.

Pushing this change to 22.0 initially just to prevent any future conflicts when sweeping. (We plan to switch the master branch to be HepMC3-based later this year.)

Tagging @sutt for info.

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