jFEX monitoring update, solving ATR-27831 and ATLASRECTS-7662
This MR is solving few monitoring issues described in:
- ATLASRECTS-7662 - Memory degradation in RAWtoALL
- ATR-27831 - JfexInputMonAlg accessing nonexistent item jtowerEtMeV
It also adds a generic jFEX plot to spot global errors.
setting urgent flag since it makes express reconstruction crash