Sweeping !55793 from 21.6 to master. PowhegControl: adding runningscales option for Wt DR and DS - AGENE-2131

Atlas Nightlybuildrequested to merge
cherry-pick-101793d8278-master into master

PowhegControl: adding runningscales option for Wt DR and DS - AGENE-2131

See merge request !55793 (merged)

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