mcparticles2 -> mcparticles, remove copiers, keep mcparticles

benchmarks/clustering/options/full_cal_reco.py

benchmarks/clustering/scripts/deprecated/barrel_clusters.cxx

benchmarks/ecal/options/barrel.py

benchmarks/ecal/options/endcap_e.py

benchmarks/ecal/options/endcap_i.py

benchmarks/far_forward/analysis/rec_far_forward_protons.cxx

benchmarks/far_forward/options/far_forward_reconstruction.py

benchmarks/imaging_ecal/options/hybrid_cluster.py

benchmarks/imaging_ecal/options/imaging_2dcluster.py

benchmarks/imaging_ecal/options/imaging_topocluster.py

benchmarks/imaging_ecal/scripts/draw_cluster.py

benchmarks/imaging_ecal/scripts/draw_cluster_layers.py

benchmarks/imaging_ecal/scripts/utils.py

benchmarks/imaging_shower_ML/options/imaging_ml_data.py

benchmarks/imaging_shower_ML/scripts/prepare_tf_dataset.py

benchmarks/rich/options/rich_reco.py

benchmarks/track_finding/options/track_reconstruction.py

benchmarks/track_finding/scripts/rec_multiple_tracks.cxx

benchmarks/track_fitting/options/track_reconstruction.py

benchmarks/track_fitting/scripts/rec_multiple_tracks.cxx