MiNNLO updates for Wj,Hj and Zj processes

Simone Amorosorequested to merge
amoroso/athena:21.6-MINNLO into 21.6

Added support for the Hj_MiNNLO and Wj_MiNNLO processes. The list of parameters and default settings has been updated to the public v3.1 MiNNLO release (AGENE-1778).

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