adds a source uid to most damage & mobstate events (#11559)

Co-authored-by: Flipp Syder <76629141+vulppine@users.noreply.github.com>

Content.Server/Chat/SuicideSystem.cs

@@ -111,7 +111,7 @@ namespace Content.Server.Chat
                 damagePrototype = _prototypeManager.Index<DamageTypePrototype>(fallback.ToString());
             }
             const int lethalAmountOfDamage = 200; // TODO: Would be nice to get this number from somewhere else
-            _damageableSystem.TryChangeDamage(target, new(damagePrototype, lethalAmountOfDamage), true);
+            _damageableSystem.TryChangeDamage(target, new(damagePrototype, lethalAmountOfDamage), true, origin: target);
         }
     }
 }