Followup of Cleanup/deprecate dune disj conj neg typetraits

Summary

Implement backports Std::conjunction, Std::disjunction and Std::negation in terms of the std implementations

Note, this prevents deprecation warnings in its own definition.

changed the description

enabled an automatic merge when the pipeline for ceea0683 succeeds

merged

mentioned in commit cd213143

mentioned in merge request !977 (merged)

picked the changes into the branch cherry-pick-cd213143 with commit b1ce35fc

mentioned in commit b1ce35fc

mentioned in merge request !978 (merged)