EvgenJobTransforms: add information about HepMC version to TagInfo and define it as env. variable
add information about HepMC version to metadata i.e. to TagInfo HepMC version (2 or 3) is also defined as an env. variable
add information about HepMC version to metadata i.e. to TagInfo HepMC version (2 or 3) is also defined as an env. variable