Merge branch 'cherry-pick-aad17805-21.0' into '21.0'

Sweeping !20595 from master to 21.0.
Bugfix importing tools in RunTier0Test.py

See merge request atlas/athena!20613

Tools/PROCTools/python/RunTier0Tests.py

@@ -12,7 +12,7 @@ import time
 import uuid
 import logging
 import glob
-from RunTier0TestsTools import ciRefFileMap
+from PROCTools.RunTier0TestsTools import ciRefFileMap
 
 ### Setup global logging
 logging.basicConfig(level=logging.INFO,