Zombies keep their anomalies on zombification (#33867)

* Zombies keep their anomalies on zombification

* Refactor anombies to isolate anomalies and zombies

InnerBodyAnomalies now send an event when the host dies.
Zombies cancels this event if the host is turning into a zombie.

* Anomazombies: deprecate CancellableEntityEventArgs

CancellableEntityEventArgs is deprecated. Use structs
with bool Cancelled instead.

Content.Server/Anomaly/Effects/InnerBodyAnomalySystem.cs

@@ -186,6 +186,11 @@ public sealed class InnerBodyAnomalySystem : SharedInnerBodyAnomalySystem
         if (args.NewMobState != MobState.Dead)
             return;
 
+        var ev = new BeforeRemoveAnomalyOnDeathEvent();
+        RaiseLocalEvent(args.Target, ref ev);
+        if (ev.Cancelled)
+            return;
+
         _anomaly.ChangeAnomalyHealth(ent, -2); //Shutdown it
     }