Sweeping !33140 from master to 21.3. Added checkNSWValTree.py script to check NSWPRDValAlg output

Atlas Nightlybuildrequested to merge
cherry-pick-884a33131c-21.3 into 21.3

Added checkNSWValTree.py script to check NSWPRDValAlg output

See merge request !33140 (merged)

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