nixos/terminfo: ignore alacritty-graphics in all-terminfo test (#424822)

nixos/tests/all-terminfo.nix

···
       ...
     }:
     let
+      # Use derivations instead of attr names to avoid listing missing packages
+      maskedTerminfos = with pkgs; [
+        alacritty-graphics # would clobber alacritty terminfo
+      ];
       infoFilter =
         name: drv:
         let
···
         && o.value ? outputs
         && builtins.elem "terminfo" o.value.outputs
         && !o.value.meta.broken
-        && lib.meta.availableOn pkgs.stdenv.hostPlatform o.value;
+        && lib.meta.availableOn pkgs.stdenv.hostPlatform o.value
+        && !(builtins.elem o.value maskedTerminfos);
       terminfos = lib.filterAttrs infoFilter pkgs;
       excludedTerminfos = lib.filterAttrs (
         _: drv: !(builtins.elem drv.terminfo config.environment.systemPackages)