Remove reportUse parameter on GameObjectAI::GossipHello and give it its own event.

Ported from 3.3.5

src/server/game/Spells/SpellEffects.cpp

@@ -1676,7 +1676,7 @@ void Spell::SendLoot(ObjectGuid guid, LootType loottype)
         }
 
         player->PlayerTalkClass->ClearMenus();
-        if (gameObjTarget->AI()->GossipHello(player, false))
+        if (gameObjTarget->AI()->GossipHello(player))
             return;
 
         switch (gameObjTarget->GetGoType())