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CopyMcEventCollection: Drop Separator GenEvents as we don't need them anymore (ATLASSIM-7226)

John Derek Chapman requested to merge jchapman/athena:ATLASSIM-7226_main into main

Separator GenEvents used in HepMC2-based McEventCollections as a way of flagging different pile-up types have been obsolete since we switched to HepMC3. They are still hanging around in some older input files though, so this MR updates CopyMcEventCollection to update the McEventCollection format as it copies it. This seems to fix the issues seen in ATLASSIM-7226.

NB This will change the output of MC Overlay jobs, but should not affect reconstruction output.

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