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TrkValTools: migration from barcodes to GenParticle::id()

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

This is part of the migration of Athena away from using GenParticle barcodes (removed in HepMC3) as a unique identifier for truth particles to GenParticle::id() instead.

Ntuple branch names have not been changed (just commented as a reminder to change them in the future), but all variables previously assigned barcode values are now assigned GenParticle::id()instead.

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