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

@@ -45,7 +45,9 @@ namespace Game.Arenas
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
+            if (!isInBattleground)
                 PlayerScores[player.GetGUID()] = new ArenaScore(player.GetGUID(), player.GetBGTeam());
 
             if (player.GetBGTeam() == Team.Alliance)        // gold

Source/Game/BattleGrounds/BattleGround.cs

@@ -1068,6 +1068,7 @@ namespace Game.BattleGrounds
             }
 
             // reset all map criterias on map enter
+            if (!isInBattleground)
                 player.ResetCriteria(CriteriaFailEvent.LeaveBattleground, GetMapId(), true);
 
             // setup BG group membership

Source/Game/BattleGrounds/Zones/ArathiBasin.cs

@@ -221,7 +221,9 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
+            if (!isInBattleground)
                 PlayerScores[player.GetGUID()] = new BattlegroundABScore(player.GetGUID(), player.GetBGTeam());
         }
 

Source/Game/BattleGrounds/Zones/EyeofStorm.cs

@@ -369,7 +369,9 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
+            if (!isInBattleground)
                 PlayerScores[player.GetGUID()] = new BgEyeOfStormScore(player.GetGUID(), player.GetBGTeam());
 
             m_PlayersNearPoint[EotSPoints.PointsMax].Add(player.GetGUID());

Source/Game/BattleGrounds/Zones/StrandofAncients.cs

@@ -481,7 +481,9 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
+            if (!isInBattleground)
                 PlayerScores[player.GetGUID()] = new BattlegroundSAScore(player.GetGUID(), player.GetBGTeam());
 
             SendTransportInit(player);

Source/Game/BattleGrounds/Zones/WarsongGluch.cs

@@ -198,7 +198,9 @@ namespace Game.BattleGrounds.Zones
 
         public override void AddPlayer(Player player)
         {
+            bool isInBattleground = IsPlayerInBattleground(player.GetGUID());
             base.AddPlayer(player);
+            if (!isInBattleground)
                 PlayerScores[player.GetGUID()] = new BattlegroundWGScore(player.GetGUID(), player.GetBGTeam());
         }