Core/SmartAI: Improve SMART_EVENT_GOSSIP_HELLO

Add another value to event_param1 for SMART_EVENT_GOSSIP_HELLO to support all cases of OnGossipHello/OnReportUse in GameObjects:
- event_param1 set to 0: execute the action for both OnGossipHello and OnReportUse. This might result in the action being executed twice when clicking the GameObject
- event_param1 set to 1: execute the action for only OnGossipHello
- event_param1 set to 2: execute the action for only OnReportUse

(cherry picked from commit 9e58ef6940)

src/server/game/AI/SmartScripts/SmartScript.cpp

@@ -3245,8 +3245,24 @@ void SmartScript::ProcessEvent(SmartScriptHolder& e, Unit* unit, uint32 var0, ui
             ProcessAction(e, unit, var0, var1, bvar, spell, gob);
             break;
         case SMART_EVENT_GOSSIP_HELLO:
-            if (e.event.gossipHello.noReportUse && var0)
-                return;
+            switch (e.event.gossipHello.filter)
+            {
+                case 0:
+                    // no filter set, always execute action
+                    break;
+                case 1:
+                    // OnGossipHello only filter set, skip action if OnReportUse
+                    if (var0)
+                        return;
+                case 2:
+                    // OnReportUse only filter set, skip action if OnGossipHello
+                    if (!var0)
+                        return;
+                default:
+                    // Ignore any other value
+                    break;
+            }
+
             ProcessAction(e, unit, var0, var1, bvar, spell, gob);
             break;
         case SMART_EVENT_IS_BEHIND_TARGET:

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

@@ -366,7 +366,7 @@ struct SmartEvent
 
         struct
         {
-            uint32 noReportUse;
+            uint32 filter;
         } gossipHello;
 
         struct