Merge branch 'feature/fix-reference-element-velocityoutput' into 'master'

Timo Kochrequested to merge
cherry-pick-25169290 into releases/3.4

[porousmediumflow][velocity] Remove namespace Dune from referenceElement

See merge request !2713 (merged)

(cherry picked from commit 25169290)

996c4e97 [porousmediumflow][velocity] Remove namespace Dune from referenceElement

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