use specific 23.0 cvmfs directory for CI references
With this MR the references are read from
/cvmfs/atlas-nightlies.cern.ch/repo/data/data-art/WorkflowReferences/23.0
the starting files are exact copies of the versions in master
With this MR the references are read from
/cvmfs/atlas-nightlies.cern.ch/repo/data/data-art/WorkflowReferences/23.0
the starting files are exact copies of the versions in master