citrix_workspace: remove unused code for unsupported versions

These unused version attributes were not imported into all-packages.nix
anymore anyway, so remove them entirely.

pkgs/applications/networking/remote/citrix-workspace/default.nix

@@ -4,24 +4,10 @@
 # reference guide: https://developer-docs.citrix.com/en-us/citrix-workspace-app-for-linux/citrix-workspace-app-for-linux-oem-reference-guide
 
 let
-  inherit (callPackage ./sources.nix { }) supportedVersions unsupportedVersions;
+  supportedVersions = callPackage ./sources.nix { };
 
   toAttrName = x: "citrix_workspace_${builtins.replaceStrings [ "." ] [ "_" ] x}";
-
-  unsupported = lib.listToAttrs (
-    map (
-      x:
-      lib.nameValuePair (toAttrName x) (throw ''
-        Citrix Workspace at version ${x} is not supported anymore!
-
-        Actively supported releases are listed here:
-        https://www.citrix.com/support/product-lifecycle/workspace-app.html
-      '')
-    ) unsupportedVersions
-  );
-
-  supported = lib.mapAttrs' (
-    attr: versionInfo: lib.nameValuePair (toAttrName attr) (callPackage ./generic.nix versionInfo)
-  ) supportedVersions;
 in
-supported // unsupported
+lib.mapAttrs' (
+  attr: versionInfo: lib.nameValuePair (toAttrName attr) (callPackage ./generic.nix versionInfo)
+) supportedVersions

pkgs/applications/networking/remote/citrix-workspace/sources.nix

@@ -106,18 +106,5 @@ let
       homepage = "https://www.citrix.com/downloads/workspace-app/linux/workspace-app-for-linux-latest.html";
     };
   };
-
-  # Retain attribute-names for abandoned versions of Citrix workspace to
-  # provide a meaningful error-message if it's attempted to use such an old one.
-  #
-  # The lifespans of Citrix products can be found here:
-  # https://www.citrix.com/support/product-lifecycle/workspace-app.html
-  unsupportedVersions = [
-    "23.02.0"
-    "23.07.0"
-    "23.09.0"
-  ];
 in
-{
-  inherit supportedVersions unsupportedVersions;
-}
+supportedVersions