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Add truth jet labels and save truth jet moments selectively: ATLMCPROD-8646

Teng Jian Khoo requested to merge khoo/athena:21.6-truthjetmoments into 21.6

On ATLMCPROD-8646, we were discussing the exact truth labelling branches that should be attached to truth jets created in EVGEN for generator filters.

Apparently in 21.6 we can't use wildcards with a selected branch list? So I hardcoded the AntiKt4TruthJets and AntiKt6TruthJets collections for now, but this could obviously be made more comprehensive and/or more intelligent.

The old JOs were trying to write out both TruthLabelID and PartonTruthLabelID. If memory serves, we phased out the former entirely, so I only added PartonTruthLabelID. I don't think this is what FTAG uses, though -- they use various *ConeTruthLabelID, so we may want to ask.

@ewelina, @cohm, @dgillber FYI. We can tag others if we want their input.

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