Clean up legacy tags handling #5940

Job	Run time
build-rewatch (macos-13, x86_64-apple-darwin)	19s
build-rewatch (macos-14, aarch64-apple-darwin)	17s
build-compiler (ubuntu-24.04, ocaml-variants.5.3.0+options,ocaml-option-static, true, true)	1m 51s
build-rewatch (ubuntu-24.04, x86_64-unknown-linux-musl)	9s
build-compiler (ubuntu-24.04-arm, ocaml-variants.5.3.0+options,ocaml-option-static, true, true, t...	3m 38s
build-rewatch (ubuntu-24.04-arm, aarch64-unknown-linux-musl)	19s
build-rewatch (windows-latest, x86_64-pc-windows-gnu)	27s
build-compiler (macos-13, 5.3.0, true)	4m 26s
build-compiler (macos-14, 5.3.0, true)	2m 32s
build-compiler (windows-latest, 5.3.0, true)	3m 21s
build-compiler (ubuntu-24.04, ocaml-variants.5.2.1+options,ocaml-option-static, true)	1m 53s
build-compiler (ubuntu-24.04, ocaml-variants.5.0.0+options,ocaml-option-static)	1m 44s
build-compiler (ubuntu-24.04, ocaml-variants.4.14.2+options,ocaml-option-static)	1m 48s
package	39s
installationTest (macos-13)	31s
installationTest (macos-14)	19s
installationTest (ubuntu-24.04)	12s
installationTest (ubuntu-24.04-arm)	19s
installationTest (windows-latest)	39s
publish	0s
	25m 23s

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