Update EXOT3ContentList.py
Updating EXOT3 format to include jet truth labelling information for UFO jets as done in JETM8 format: https://gitlab.cern.ch/atlas/athena/-/blob/21.2/PhysicsAnalysis/DerivationFramework/DerivationFrameworkJetEtMiss/python/AntiKt10TruthJetsCPContent.py?ref_type=heads
this is needed to include all the jets uncertainties.
tagging @sschramm