Sweep xAODParticleEvent truth counters to master
Cherry picks the commits of !32714 (merged) (adds xAOD::TruthParticle counter methods to xAODParticleEvent). Needed for the HWW analyses utilizing the Common Analysis Framework.
Cherry picks the commits of !32714 (merged) (adds xAOD::TruthParticle counter methods to xAODParticleEvent). Needed for the HWW analyses utilizing the Common Analysis Framework.