users/services: remove ConditionEnvironment option

modules/users/default.nix

@@ -69,10 +69,6 @@ let
           only once the name is registered will the service be considered "active".
         '';
       };
-      unitConfig.ConditionEnvironment = mkOption {
-        type = types.nullOr types.str;
-        default = null;
-      };
     };
   };
   userOptions = {

modules/users/systemd.nix

@@ -9,9 +9,6 @@ let
     ;
     serviceConfig = lib.filterAttrs (_: v: v != null) value.serviceConfig;
     unitConfig = {
-      inherit (value.unitConfig)
-        ConditionEnvironment
-      ;
       After = value.after;
       Before = value.before;
       BindsTo = value.bindsTo;