cleaned up regtest #14541

Job	Run time
regression (macos-13, ocaml-variants.4.14.2+options,ocaml-option-flambda)	28m 22s
regression (ubuntu-22.04, ocaml-variants.4.14.2+options,ocaml-option-flambda)	7m 35s
extraction	0s
	35m 57s

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