Manual sweep from 21.6 to master: LHE filters and Powheg Wt_DR_modified

Timothee Theveneaux-Pelzerrequested to merge
atlas-physics/pmg/mcexperts/powheg-experts/athena:master-PowhegControl-LHEFiltersUpdate-Wt_modifiedFix into master

This MR makes a "manual" sweep from 21.6 to master, for both !51572 (merged) and !51598 (merged)

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