Require hwid (#35331)

* Make cvar to require that the client has a modern hwid

* Ignore guests and don't disable cvar on dev

* Rename and add docs

Content.Server.Database/Model.cs

@@ -987,6 +987,8 @@ namespace Content.Server.Database
         BabyJail = 4,
         /// Results from rejected connections with external API checking tools
         IPChecks = 5,
+        /// Results from rejected connections who are authenticated but have no modern hwid associated with them.
+        NoHwid = 6
     }
 
     public class ServerBanHit