fix(Scripts/BlackrockSpire): Urok Doomhowl - improvements: (#9067)

The mobs should attack the pike if there is no players around
The boss should not despawning after summon
Urok's Tribute Pile with Pike and Head should disapear after Urok appear
Fixes #9023

src/server/game/AI/SmartScripts/SmartScriptMgr.h

@@ -1460,6 +1460,13 @@ struct SmartTarget
             uint32 dead;
         } closest;
 
+        struct
+        {
+            uint32 entry;
+            uint32 dist;
+            uint32 onlySpawned;
+        } closestGameobject;
+
         struct
         {
             uint32 maxDist;