Merge branch 'cleenup/deprecate-dune-disj-conj-neg-typetraits' into 'master'

Simon Praetoriusrequested to merge
cherry-pick-47b6d772 into releases/2.8

Cleanup/deprecate dune disj conj neg typetraits

See merge request !972 (merged)

(cherry picked from commit 47b6d772)

333027ad [test] Remove test of outdated typetraits which are no replaced by standard library features b03a0553 [typetraits] Deprecated and replace occurrences of Dune::Std::conjunction/disjuction/negation

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