Fix aHelp relay to detect AFK Admins (#24482)

* Add AFK detection for aHelp relay and admin specific afk time.

* Correct query to new refactor

* Change AFK timeout to 10min or else Pancake closes my PR 😭

* It wasnt a bug it was a feature, way less aHelps that way.

* aHelp Colors arn't real!

* Update Content.Shared/CCVar/CCVars.cs

---------

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Shared/CCVar/CCVars.cs

@@ -833,6 +833,12 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<int> NewPlayerThreshold =
             CVarDef.Create("admin.new_player_threshold", 0, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
 
+        /// <summary>
+        /// How long an admin client can go without any input before being considered AFK.
+        /// </summary>
+        public static readonly CVarDef<float> AdminAfkTime =
+            CVarDef.Create("admin.afk_time", 600f, CVar.SERVERONLY);
+
         /*
          * Explosions
          */