use weighted random for ninja threats (#20469)

* change threats to be weighted random and a little cleanup

* ninja rule stores weighted random id for threats

* move threats out of the rule and into weighted random

---------

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Communications/SharedCommsHackerSystem.cs

@@ -10,9 +10,9 @@ namespace Content.Shared.Communications;
 public abstract class SharedCommsHackerSystem : EntitySystem
 {
     /// <summary>
-    /// Set the list of threats to choose from when hacking a comms console.
+    /// Set the threats prototype to choose from when hacking a comms console.
     /// </summary>
-    public void SetThreats(EntityUid uid, List<Threat> threats, CommsHackerComponent? comp = null)
+    public void SetThreats(EntityUid uid, string threats, CommsHackerComponent? comp = null)
     {
         if (!Resolve(uid, ref comp))
             return;