Adapt right-handed heavy neutrino PDGIDs in the mLRSM model

As described in the MR!219 comments, we would like to adapt the PDG IDs for the heavy right-handed neutrinos, to have them available in the TruthBSM branch.

mentioned in merge request !219 (merged)

added 5 commits

• 84b07800...656861ea - 4 commits from branch atlas-generators-team:main
• fa249ab2 - Adapt RH HN PDGIDs

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Looks great — thanks!

merged

mentioned in commit 2913d874

mentioned in merge request !224 (merged)