nixosTests.gnome-xorg: drop

The capability was really dropped in 8fa1c6d44d.
This fixes eval:
  error: Default graphical session, 'gnome-xorg', not found.
  Valid names for 'services.displayManager.defaultSession' are:
    gnome

nixos/release-combined.nix

@@ -100,7 +100,6 @@ rec {
         (onFullSupported "nixos.tests.fontconfig-default-fonts")
         (onFullSupported "nixos.tests.gitlab")
         (onFullSupported "nixos.tests.gnome")
-        (onFullSupported "nixos.tests.gnome-xorg")
         (onSystems [ "x86_64-linux" ] "nixos.tests.hibernate")
         (onFullSupported "nixos.tests.i3wm")
         (onSystems [ "aarch64-linux" ] "nixos.tests.installer.simpleUefiSystemdBoot")

nixos/tests/all-tests.nix

@@ -642,7 +642,6 @@ in
   gnome = runTest ./gnome.nix;
   gnome-extensions = runTest ./gnome-extensions.nix;
   gnome-flashback = runTest ./gnome-flashback.nix;
-  gnome-xorg = runTest ./gnome-xorg.nix;
   gns3-server = runTest ./gns3-server.nix;
   gnupg = runTest ./gnupg.nix;
   go-camo = runTest ./go-camo.nix;

nixos/tests/gnome-xorg.nix

@@ -1,110 +0,0 @@
-{ pkgs, lib, ... }:
-{
-  name = "gnome-xorg";
-  meta = {
-    maintainers = lib.teams.gnome.members;
-  };
-
-  nodes.machine =
-    { nodes, ... }:
-    let
-      user = nodes.machine.users.users.alice;
-    in
-
-    {
-      imports = [ ./common/user-account.nix ];
-
-      services.xserver.enable = true;
-
-      services.displayManager.gdm = {
-        enable = true;
-        debug = true;
-      };
-
-      services.displayManager.autoLogin = {
-        enable = true;
-        user = user.name;
-      };
-
-      services.desktopManager.gnome.enable = true;
-      services.desktopManager.gnome.debug = true;
-      services.displayManager.defaultSession = "gnome-xorg";
-
-      systemd.user.services = {
-        "org.gnome.Shell@x11" = {
-          serviceConfig = {
-            ExecStart = [
-              # Clear the list before overriding it.
-              ""
-              # Eval API is now internal so Shell needs to run in unsafe mode.
-              # TODO: improve test driver so that it supports openqa-like manipulation
-              # that would allow us to drop this mess.
-              "${pkgs.gnome-shell}/bin/gnome-shell --unsafe-mode"
-            ];
-          };
-        };
-      };
-
-    };
-
-  testScript =
-    { nodes, ... }:
-    let
-      user = nodes.machine.users.users.alice;
-      uid = toString user.uid;
-      bus = "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/${uid}/bus";
-      xauthority = "/run/user/${uid}/gdm/Xauthority";
-      display = "DISPLAY=:0.0";
-      env = "${bus} XAUTHORITY=${xauthority} ${display}";
-      # Run a command in the appropriate user environment
-      run = command: "su - ${user.name} -c '${bus} ${command}'";
-
-      # Call javascript in gnome shell, returns a tuple (success, output), where
-      # `success` is true if the dbus call was successful and output is what the
-      # javascript evaluates to.
-      eval =
-        command:
-        run "gdbus call --session -d org.gnome.Shell -o /org/gnome/Shell -m org.gnome.Shell.Eval ${command}";
-
-      # False when startup is done
-      startingUp = eval "Main.layoutManager._startingUp";
-
-      # Start Console
-      launchConsole = run "gapplication launch org.gnome.Console";
-
-      # Hopefully Console's wm class
-      wmClass = eval "global.display.focus_window.wm_class";
-    in
-    ''
-      with subtest("Login to GNOME Xorg with GDM"):
-          machine.wait_for_x()
-          # Wait for alice to be logged in"
-          machine.wait_for_unit("default.target", "${user.name}")
-          machine.wait_for_file("${xauthority}")
-          machine.succeed("xauth merge ${xauthority}")
-          # Check that logging in has given the user ownership of devices
-          # Change back to /dev/snd/timer after systemd-258.1
-          assert "alice" in machine.succeed("getfacl -p /dev/dri/card0")
-
-      with subtest("Wait for GNOME Shell"):
-          # correct output should be (true, 'false')
-          machine.wait_until_succeeds(
-              "${startingUp} | grep -q 'true,..false'"
-          )
-
-      with subtest("Open Console"):
-          # Close the Activities view so that Shell can correctly track the focused window.
-          machine.send_key("esc")
-
-          machine.succeed(
-              "${launchConsole}"
-          )
-          # correct output should be (true, '"kgx"')
-          # For some reason, this deviates from Wayland.
-          machine.wait_until_succeeds(
-              "${wmClass} | grep -q  'true,...kgx'"
-          )
-          machine.sleep(20)
-          machine.screenshot("screen")
-    '';
-}