Merge #258573: nixos/release-combined: make gitlab a channel blocker

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nixos/release-combined.nix
··· 79 79 80 80 (onFullSupported "nixos.tests.firewall") 81 81 (onFullSupported "nixos.tests.fontconfig-default-fonts") 82 + (onFullSupported "nixos.tests.gitlab") 82 83 (onFullSupported "nixos.tests.gnome") 83 84 (onFullSupported "nixos.tests.gnome-xorg") 84 85 (onSystems ["x86_64-linux"] "nixos.tests.hibernate")