jFEX Type mismatch and ReadHandle names and isSaturated as a vector

This MR is meant to solve three issues:

• Type mismatch of iEta and iPhi (with gFexDataTowers) -> now globalEta and globalPhi
• Change the names of the FEX Towers:
  • L1_jTowers -> L1_jFexDataTowers
  • L1_gTowers -> L1_gFexDataTowers
  • L1_eTowers -> L1_eFexDataTowers
• Change for jFexDataTowers the isSaturated char variable to be a vector of chars (so when building the jTower it allows to get a 2Dvector [EM, HAD] )

JIRA: ATR-26355