build

Move the runtime files under runtime/js #3205

Job	Run time
lint-fmt	2m 43s
build (ubuntu-latest, 4.08, true, true, true)	3m 27s
build (ubuntu-latest, 4.09, true, true, true)	3m 18s
lint-opam	4m 2s
build (ubuntu-latest, 4.10, true, true, true)	7m 27s
build (ubuntu-latest, 4.11, true, true, true)	3m 23s
build (ubuntu-latest, 4.12, true, true, true)	3m 43s
build (ubuntu-latest, 4.13, true, true, true)	3m 25s
lint-runtime	9s
build (ubuntu-latest, 5.0, true, true, true)	3m 13s
build (ubuntu-latest, 5.1, true, true, true)	4m 6s
build (ubuntu-latest, 4.14, true, false, true)	7m 47s
build (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-32bit, true, false, true)	7m 16s
build (macos-latest, 4.14, true, false, true)	8m 22s
build (windows-latest, 4.14, true, false, true)	15m 10s
build (ubuntu-latest, 5.2, false, false, false)	11m 17s
build (ubuntu-latest, ocaml-variants.5.2.0+options,ocaml-option-32bit, true, true, true)	7m 54s
build (macos-latest, 5.2, true, false, true)	10m 44s
build (windows-latest, 5.2, false, false, true)	20m 56s
	2h 8m 22s

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