Sweeping !32499 from 21.3 to 21.9. Switching diff-root checks in ISF_Validation ART jobs to semi-detailed output

Atlas Nightlybuildrequested to merge
cherry-pick-9106cf921a-21.9 into 21.9

Switching diff-root checks in ISF_Validation ART jobs to semi-detailed output

See merge request !32499 (merged)

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