refactor(Core): remove unused imports (#9767)

src/server/scripts/World/npcs_special.cpp

@@ -36,7 +36,6 @@ npc_locksmith            75%    list of keys needs to be confirmed
 npc_firework            100%    NPC's summoned by rockets and rocket clusters, for making them cast visual
 EndContentData */
 
-#include "Cell.h"
 #include "CellImpl.h"
 #include "Chat.h"
 #include "CombatAI.h"
@@ -44,8 +43,6 @@ EndContentData */
 #include "DBCStructure.h"
 #include "GameEventMgr.h"
 #include "GridNotifiers.h"
-#include "GridNotifiersImpl.h"
-#include "Group.h"
 #include "ObjectMgr.h"
 #include "PassiveAI.h"
 #include "Pet.h"
@@ -58,6 +55,12 @@ EndContentData */
 #include "WaypointMgr.h"
 #include "World.h"
 
+// TODO: this import is not necessary for compilation and marked as unused by the IDE
+//  however, for some reasons removing it would cause a damn linking issue
+//  there is probably some underlying problem with imports which should properly addressed
+//  see: https://github.com/azerothcore/azerothcore-wotlk/issues/9766
+#include "GridNotifiersImpl.h"
+
 enum elderClearwater
 {
     EVENT_CLEARWATER_ANNOUNCE           = 1,