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Fixes HDBS2 truth containers and adds tau particle flow object containers

Robert James Ward requested to merge roward/athena:21.2-feature-hdbs2-tauPFOs into 21.2

Updates the HDBS2 derivation to fix issues with the truth containers, and add Tau particle flow objects required for the reconstruction of the neutral pion in the H->D*+gamma and H->omega+gamma HLRS analyses.

Truth container fixes:

  1. Update "TruthBoson" to "TruthBosons" for the "TruthBosonsWithDecayParticles" and "TruthBosonsWithDecayVertices" containers, which is their current name
  2. Reorder the declaration of:
addBosonsAndDownstreamParticles(DerivationFrameworkJob, -1)
addStandardTruthContents(DerivationFrameworkJob)

The standard truth contents declare a version of "addBosonsAndDownstreamParticles" within, which only saves the default first downstream generation of Higgs and Z boson decays; we require the full decay chain be saved (achieved with the option "-1"). Explicitly defining "addBosonsAndDownstreamParticles(DerivationFrameworkJob, -1)" before the standard truth contents ensures that our options are the ones used.

Added TauPFO content:

  • TauNeutralParticleFlowObject and TauChargedParticleFlowObject containers with relevant properties, as well as the corresponding TauJet object links.

This is based on the approach in the HIGG4D derivations in "DerivationFrameworkHiggs/python/HIGG4DxSlimming.py". Adding the TauPFO containers and object links increases the event size by 0.9% (90.2 kb/event to 91.0 kb/event).

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