CMS dataset v2.5.0: remove neutrinos from truth jets, postprocessing cleanup

[jpata]

• truth jets from CMSSW here are defined as ak4GenJet, not ak4GenJetsNoNu, therefore they include unreconstructable neutrinos and bias the final plots
  • therefore, redefine truth jets in postprocessing2.py to not include neutrinos
  • rename gp_ to cp_ for consistency in postprocessing2.py
• split tfds generation to independent subsets 1-10, such that they can be generated separately
• plotting code for CMS dataset validation using high statistics

TODO:

• [x] regenerate postprocessing
• [x] regenerate tfds
• [ ] re-evaluate model (retraining not needed as inputs or targets did not change)