More deprecations in Pervasives; add Stdlib.Pair and Stdlib.Int.Ref #6338

Job	Run time
build-rewatch (macos-13, x86_64-apple-darwin)	30s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true)	1m 20s
build-rewatch (macos-14, aarch64-apple-darwin)	15s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	2m 28s
build-rewatch (ubuntu-24.04, x86_64-unknown-linux-musl)	8s
build-compiler (macos-13, 5.3.0, true)	4m 13s
build-rewatch (ubuntu-24.04-arm, aarch64-unknown-linux-musl)	16s
build-compiler (macos-14, 5.3.0, true)	1m 59s
build-rewatch (windows-latest, x86_64-pc-windows-gnu)	43s
build-compiler (windows-latest, 5.3.0, true)	2m 50s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static)	1m 32s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static)	1m 19s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static)	1m 16s
package	39s
installationTest (macos-13)	22s
installationTest (macos-14)	14s
installationTest (ubuntu-24.04)	14s
installationTest (ubuntu-24.04-arm)	20s
installationTest (windows-latest)	53s
publish	0s
	21m 31s

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