Migrate TruthParticleContainer tests to HepMC3

Andrii Verbytskyirequested to merge
averbyts/athena:hepmc3_nightly_fixes_04122020_part_4 into master

In this MR:

  • Migrate TruthParticleContainer tests to HepMC3
    • Use the smart pointers from HepMC3
Edited by Andrii Verbytskyi

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