Core/Auras: Implement spell effect attribute NoScaleWithStack (0x40)

Port From (https://github.com/TrinityCore/TrinityCore/commit/b832ed2479c039958bce40c3c26294fc67acf744)

Source/Game/Spells/Auras/AuraEffect.cs

@@ -122,7 +122,8 @@ namespace Game.Spells
             }
 
             GetBase().CallScriptEffectCalcAmountHandlers(this, ref amount, ref m_canBeRecalculated);
-            amount *= GetBase().GetStackAmount();
+            if (!GetSpellEffectInfo().EffectAttributes.HasFlag(SpellEffectAttributes.NoScaleWithStack))
+                amount *= GetBase().GetStackAmount();
             return amount;
         }
         public void CalculatePeriodic(Unit caster, bool resetPeriodicTimer = true, bool load = false)

Source/Game/Spells/SpellInfo.cs

@@ -3666,6 +3666,7 @@ namespace Game.Spells
             Scaling.Coefficient = effect.Coefficient;
             Scaling.Variance = effect.Variance;
             Scaling.ResourceCoefficient = effect.ResourceCoefficient;
+            EffectAttributes = effect.EffectAttributes;
 
             ImplicitTargetConditions = null;
 
@@ -4408,6 +4409,7 @@ namespace Game.Spells
         public FlagArray128 SpellClassMask;
         public float BonusCoefficientFromAP;
         public List<Condition> ImplicitTargetConditions;
+        public SpellEffectAttributes EffectAttributes;
         public ScalingInfo Scaling;
 
         ImmunityInfo _immunityInfo;