Violation witness feasibility analysis using `Witch` #14632

Job	Run time
regression (ubuntu-22.04, ocaml-variants.4.14.2+options,ocaml-option-flambda)	8m 21s
regression (macos-13, ocaml-variants.4.14.2+options,ocaml-option-flambda)	21m 16s
extraction	0s
	29m 37s

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