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Patch for ATLASSIM-6901

John Derek Chapman requested to merge jchapman/athena:PatchBrokenGenVertexStatuses_main into main

!65095 (merged) highlighted that HepMC2::GenVertex::id (now HepMC::GenVertex::status) was not set for GenVertex instances created during simulation for some older samples due to a bug in certain MC15/MC16 production releases. (See ATLASSIM-6901.) It should have been set to 1000 + Geant4 physics process code. This merge request patches the 0 status values to a more reasonable value (1000), which still indicates that the Geant4 physics process code was not set, but allows the status-based helper function to work properly.

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