gdm: Move from gnome scope to top-level

nixos/modules/services/x11/display-managers/gdm.nix

···
 let
 
   cfg = config.services.xserver.displayManager;
-  gdm = pkgs.gnome.gdm;
+  gdm = pkgs.gdm;
   pamCfg = config.security.pam.services;
   settingsFormat = pkgs.formats.ini { };
   configFile = settingsFormat.generate "custom.conf" cfg.gdm.settings;
···
         auth      requisite     pam_nologin.so
         auth      required      pam_succeed_if.so uid >= 1000 quiet
         ${lib.optionalString pamCfg.login.enableGnomeKeyring ''
-          auth       [success=ok default=1]      ${pkgs.gnome.gdm}/lib/security/pam_gdm.so
+          auth       [success=ok default=1]      ${gdm}/lib/security/pam_gdm.so
           auth       optional                    ${pkgs.gnome-keyring}/lib/security/pam_gnome_keyring.so
         ''}
         auth      required      pam_permit.so
···
         auth       required                    ${pkgs.fprintd}/lib/security/pam_fprintd.so
         auth       required                    pam_env.so
         ${lib.optionalString pamCfg.login.enableGnomeKeyring ''
-          auth       [success=ok default=1]      ${pkgs.gnome.gdm}/lib/security/pam_gdm.so
+          auth       [success=ok default=1]      ${gdm}/lib/security/pam_gdm.so
           auth       optional                    ${pkgs.gnome-keyring}/lib/security/pam_gnome_keyring.so
         ''}
 

pkgs/desktops/gnome/core/gdm/default.nix pkgs/by-name/gd/gdm/package.nix

···
   separateDebugInfo = true;
 
   passthru = {
-    updateScript = gnome.updateScript {
-      packageName = "gdm";
-      attrPath = "gnome.gdm";
-    };
+    updateScript = gnome.updateScript { packageName = "gdm"; };
 
     # Used in GDM NixOS module
     # Don't remove.

pkgs/desktops/gnome/default.nix

···
 
   caribou = callPackage ./core/caribou { };
 
-  gdm = callPackage ./core/gdm { };
-
   gnome-bluetooth = callPackage ./core/gnome-bluetooth { };
 
   gnome-bluetooth_1_0 = callPackage ./core/gnome-bluetooth/1.0 { };
···
   file-roller = lib.warn "The ‘gnome.file-roller’ was moved to top-level. Please use ‘pkgs.file-roller’ directly." pkgs.file-roller; # Added on 2024-06-13.
   five-or-more = lib.warn "The ‘gnome.five-or-more’ was moved to top-level. Please use ‘pkgs.five-or-more’ directly." pkgs.five-or-more; # Added on 2024-08-11.
   four-in-a-row = lib.warn "The ‘gnome.four-in-a-row’ was moved to top-level. Please use ‘pkgs.four-in-a-row’ directly." pkgs.four-in-a-row; # Added on 2024-08-11.
+  gdm = lib.warn "The ‘gnome.gdm’ was moved to top-level. Please use ‘pkgs.gdm’ directly." pkgs.gdm; # Added on 2024-08-11.
   geary = lib.warn "The ‘gnome.geary’ was moved to top-level. Please use ‘pkgs.geary’ directly." pkgs.geary; # Added on 2024-06-22.
   ghex = lib.warn "The ‘gnome.ghex’ was moved to top-level. Please use ‘pkgs.ghex’ directly." pkgs.ghex; # Added on 2024-06-22.
   gitg = lib.warn "The ‘gnome.gitg’ was moved to top-level. Please use ‘pkgs.gitg’ directly." pkgs.gitg; # Added on 2024-06-22.