refactor: remove [Dune_rules.Package] #27900

Job	Run time
Format	1m 10s
Nix (macos-latest)	1m 9s
Nix (ubuntu-latest)	55s
Coq 8.16.1	1m 11s
Build (macos-latest, 4.14.x)	1s
Build (ubuntu-latest, 4.14.x)	57s
Coverage (4.14.x)	58s
Build monorepo benchmark docker image	1m 8s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	54s
Build microbenchmarks	1m 11s
Build (5.1.x, ubuntu-latest, true)	58s
Build (5.1.x, macos-latest, true)	57s
Create local opam switch (macos-latest, 5)	1m 11s
Build (4.14.x, macos-13, true)	55s
Create local opam switch (macos-latest, 4.14)	57s
Create local opam switch (ubuntu-latest, 5)	1m 10s
Create local opam switch (ubuntu-latest, 4.14)	1m 10s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	55s
Build (ocaml-base-compiler.4.14.2,system-mingw, windows-latest)	56s
Build (4.13.x, ubuntu-latest, true)	58s
Documentation	1m 9s
Build (4.08.x, ubuntu-latest, true)	56s
Build (4.04.x, ubuntu-latest, true, true)	59s
Build (4.02.x, ubuntu-latest, true)	56s
	23m 41s

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