Ghost probability update for long (no UT) pp and PbPb

Updated training of ghostprobability for Long tracks (no UT) for both PbPb and pp.

Training, etc. by @duliu @mexu

Trained on

• for PbPb: /MC/Dev/PbPb-Beam2680GeV-expected-2023-VeloClosed23.5mm-MagDown-Fix1-EPOS/Sim10b-peripheral/30000000/XDIGI
• for pp: /MC/Upgrade/30000000/Beam7000GeV-Upgrade-MagUp-Nu7.6-25ns-Pythia8/Sim10-Up08/Digi15-Up04/XDIGI

Goes with Moore!2684 (merged)

fyi: @decianm

resolves #243 (closed)

NOTE: this is just to update the training. More sustainable/maintainable infrastructure is WIP (see e.g. #460 and LHCb!4305 (merged))