Sweeping !33750 from 21.3 to master. NSWPRDValAlg: demote WARNING and catch negative channel numbers in matching (ATLASRECTS-5483)

Atlas Nightlybuildrequested to merge
cherry-pick-2c37915b4c-master into master

NSWPRDValAlg: demote WARNING and catch negative channel numbers in matching (ATLASRECTS-5483)

See merge request !33750 (merged)

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