Description of changes

This PR retires systemdMinimal. It's a follow-up to #261798. The goal is to avoid having multiple sets of systemd binaries in a typical system closure and save everyone some disk space. This is especially relevant for smaller image-based systems (see #263462).

We replace systemdMinimal with:

• systemd, if systemd commands or udevadm is needed (bluez) or when systemd is already in the closure (dbus)
• systemdLibs
  • for dependencies of systemd itself to break dependencies
  • for packages that just need libudev or libsystemd that don't already have systemd in their closure.

Some of the uses of systemdLibs could just be systemd, if we manage to give pkgs.systemd a lib output that doesn't drag in lots of unneeded binaries.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 23.11 Release Notes (or backporting 23.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.