Sweeping !25066 from 21.0 to master. Sweeping !25041 from 21.2 to 21.0.Bugfix in TrkVertexFitters

Atlas Nightlybuildrequested to merge
cherry-pick-2d2a34c1e1-master into master

Sweeping !25041 (merged) from 21.2 to 21.0. Bugfix in TrkVertexFitters

See merge request !25066 (merged)

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