Draft: bbyy GNN 2bjets selection update

Yixiang Zhangrequested to merge
yixiang/easyjet:bbyyGNNUpdate into main
  • add the index of the third of the fourth jet of GNN case
  • add KF variables for GNN selected jets
  • no need to swap to keep the same pcbt ordered with GN2 case
Edited by Yixiang Zhang

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