Core/Battlegrounds: Avoid reset BG and Arena scoreboard stats and BG map achievement criterias when relogin if player was already in the BG

Port From (https://github.com/TrinityCore/TrinityCore/commit/1bfbc371d5e2c756da6dc9f658cafcac5779ff60)

Source/Game/Arenas/Arena.cs

@@ -45,8 +45,10 @@ namespace Game.Arenas
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
-            PlayerScores[player.GetGUID()] = new ArenaScore(player.GetGUID(), player.GetBGTeam());
+            if (!isInBattleground)
+                PlayerScores[player.GetGUID()] = new ArenaScore(player.GetGUID(), player.GetBGTeam());
 
             if (player.GetBGTeam() == Team.Alliance)        // gold
             {

Source/Game/BattleGrounds/BattleGround.cs

@@ -1068,7 +1068,8 @@ namespace Game.BattleGrounds
             }
 
             // reset all map criterias on map enter
-            player.ResetCriteria(CriteriaFailEvent.LeaveBattleground, GetMapId(), true);
+            if (!isInBattleground)
+                player.ResetCriteria(CriteriaFailEvent.LeaveBattleground, GetMapId(), true);
 
             // setup BG group membership
             PlayerAddedToBGCheckIfBGIsRunning(player);

Source/Game/BattleGrounds/Zones/ArathiBasin.cs

@@ -221,8 +221,10 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
-            PlayerScores[player.GetGUID()] = new BattlegroundABScore(player.GetGUID(), player.GetBGTeam());
+            if (!isInBattleground)
+                PlayerScores[player.GetGUID()] = new BattlegroundABScore(player.GetGUID(), player.GetBGTeam());
         }
 
         public override void RemovePlayer(Player Player, ObjectGuid guid, Team team)

Source/Game/BattleGrounds/Zones/EyeofStorm.cs

@@ -369,8 +369,10 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
-            PlayerScores[player.GetGUID()] = new BgEyeOfStormScore(player.GetGUID(), player.GetBGTeam());
+            if (!isInBattleground)
+                PlayerScores[player.GetGUID()] = new BgEyeOfStormScore(player.GetGUID(), player.GetBGTeam());
 
             m_PlayersNearPoint[EotSPoints.PointsMax].Add(player.GetGUID());
         }

Source/Game/BattleGrounds/Zones/StrandofAncients.cs

@@ -481,8 +481,10 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
-            PlayerScores[player.GetGUID()] = new BattlegroundSAScore(player.GetGUID(), player.GetBGTeam());
+            if (!isInBattleground)
+                PlayerScores[player.GetGUID()] = new BattlegroundSAScore(player.GetGUID(), player.GetBGTeam());
 
             SendTransportInit(player);
 

Source/Game/BattleGrounds/Zones/WarsongGluch.cs

@@ -198,8 +198,10 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
-            PlayerScores[player.GetGUID()] = new BattlegroundWGScore(player.GetGUID(), player.GetBGTeam());
+            if (!isInBattleground)
+                PlayerScores[player.GetGUID()] = new BattlegroundWGScore(player.GetGUID(), player.GetBGTeam());
         }
 
         void RespawnFlag(Team Team, bool captured)