Core/GameObjects: Skip LoS checks for traps (#23936)

* Core/GameObjects: Skip LoS checks for traps

* Core/GameObjects: Fix spells cast by traps missing always

* Scripts/Spells: Fix WSG heal buff not healing

The WSG green heal buff is now cast by a GameObject so the spell target should be used to calculate the healing, not the GameObject.

# Conflicts:
#	src/server/scripts/Spells/spell_generic.cpp

src/server/game/Entities/GameObject/GameObject.cpp

@@ -1224,6 +1224,14 @@ uint8 GameObject::getLevelForTarget(WorldObject const* target) const
     if (Unit* owner = GetOwner())
         return owner->getLevelForTarget(target);
 
+    if (GetGoType() == GAMEOBJECT_TYPE_TRAP)
+    {
+        if (GetGOInfo()->trap.level != 0)
+            return GetGOInfo()->trap.level;
+        if (const Unit* targetUnit = target->ToUnit())
+            return targetUnit->GetLevel();
+    }
+
     return 1;
 }