Generators: use fully hadronised dummy event for Rivet ART tests
See title: This change set just replaces the dummy event in favour of a fully hadronised event to fix issues related to missing beam particles in FixHepMC and Rivet_i.
cc @ewelina
GitLab Registry scheduled maintenance on Wednesday, October 09th 2024 as of 20:00h Geneva time for a period of 1 hour. Further information under https://cern.ch/otg0152540.
See title: This change set just replaces the dummy event in favour of a fully hadronised event to fix issues related to missing beam particles in FixHepMC and Rivet_i.
cc @ewelina