Core/Units: Added helper function to clear boss emote frame and enable SMSG_CLEAR_BOSS_EMOTES

Port From (https://github.com/TrinityCore/TrinityCore/commit/deb24f3f53540733bef15f0a90a1b7e41e76d60e)

Source/Game/Entities/Unit/Unit.cs

@@ -437,6 +437,26 @@ namespace Game.Entities
             target.SendPacket(data);
         }
 
+        /// <summary>
+        /// Clears boss emotes frame
+        /// </summary>
+        /// <param name="zoneId">Only clears emotes for players in that zone id</param>
+        /// <param name="target">Only clears emotes for that player</param>
+        public void ClearBossEmotes(uint? zoneId, Player target)
+        {
+            ClearBossEmotes clearBossEmotes = new();
+
+            if (target != null)
+            {
+                target.SendPacket(clearBossEmotes);
+                return;
+            }
+
+            foreach (var player in GetMap().GetPlayers())
+                if (!zoneId.HasValue || Global.DB2Mgr.IsInArea(player.GetAreaId(), zoneId.Value))
+                    player.SendPacket(clearBossEmotes);
+        }
+
         public override void UpdateObjectVisibility(bool forced = true)
         {
             if (!forced)

Source/Game/Networking/Packets/ChatPackets.cs

@@ -334,6 +334,13 @@ namespace Game.Networking.Packets
         public int EmoteID;
     }
 
+    class ClearBossEmotes : ServerPacket
+    {
+        public ClearBossEmotes() : base(ServerOpcodes.ClearBossEmotes) { }
+
+        public override void Write() { }
+    }
+
     public class PrintNotification : ServerPacket
     {
         public PrintNotification(string notifyText) : base(ServerOpcodes.PrintNotification)