add xAOD::JetTrigAuxContainer to SlimmingHelper (AFT-658)
Add xAOD::JetTrigAuxContainer to SlimmingHelper so that the HLT aux items can be appended to the FinalItemList.
- We do not need to add aux items explicitly for HLT_xAOD__JetContainer_GSCJet and HLT_xAOD__JetContainer_SplitJet in FTAG2
- Warning: this would affect other derivation formats which use HLT_xAOD__JetContainer*Aux.
Edited by Ligang Xia