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ISF_Fatras: use GenParticle::id() rather than barcodes in HepMcParticleLink constructors

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

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

ISF_Fatras HitCreator tools updated to use id rather than barcode in HepMcParticleLink constructors.

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