Sweeping !56822 from master to 22.0. For HepMC3, GenParticle barcodes can only be set once they are associated with a GenEvent

Atlas Nightlybuildrequested to merge
cherry-pick-2085f2e14e5-22.0 into 22.0

For HepMC3, GenParticle barcodes can only be set once they are associated with a GenEvent

See merge request !56822 (merged)

Merge request reports