Merge branch '21.0-UpdateRunTier0Tests-ReferenceFileLocationUpdate' into '21.0'

Update RunTier0Tests.py to read the reference files from EOS if possible and a minor typo fix in log printout

See merge request atlas/athena!9958

Former-commit-id: 93c7a8c170f77d3f72e5654f7693b2c315c60db1