Change name of Imaging BEMC collections

benchmarks/clustering/full_cal_clusters.sh

benchmarks/clustering/options/full_cal_reco.py

benchmarks/ecal/options/barrel.py

benchmarks/ecal/run_emcal_benchmarks.py

benchmarks/full/options/full_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/run_emcal_barrel.sh

benchmarks/imaging_ecal/run_imcal_pion0.sh