Use dune test stanza #2706

Job	Run time
lint-fmt	2m 46s
lint-opam	4m 52s
build (ubuntu-latest, 4.08, true, true, true)	3m 37s
build (ubuntu-latest, 4.09, true, true, true)	3m 37s
build (ubuntu-latest, 4.10, true, true, true)	3m 41s
build (ubuntu-latest, 4.11, true, true, true)	3m 56s
build (ubuntu-latest, 4.12, true, true, true)	3m 55s
build (ubuntu-latest, 4.13, true, true, true)	3m 47s
build (ubuntu-latest, 5.0, true, true, true)	3m 26s
build (ubuntu-latest, 5.1, true, true, true)	4m 43s
build (ubuntu-latest, 4.14, true, false, true)	8m 9s
build (macos-latest, 4.14, true, false, true)	11m 7s
build (windows-latest, 4.14, true, false, true)	9m 17s
build (ubuntu-latest, 5.2, false, false, false)	11m 27s
build (macos-latest, 5.2, true, false, true)	10m 59s
build (windows-latest, 5.2, false, false, true)	10m 29s
	1h 39m 48s

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