Merge branch 'FixATLASSIM-3988_21.0' into '21.0'

John Derek Chapmanrequested to merge
cherry-pick-22453508 into 21.3

Update diff-root tests for DigitizationTests ART jobs

See merge request !21070 (merged)

(cherry picked from commit 22453508)

5fb6d953 Update diff-root tests for DigitizationTests ART jobs

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