Core/Misc: don't allow players to use/activate/loot non-allowed gameobjects while under the effect of a damage immunity aura

Port From (https://github.com/TrinityCore/TrinityCore/commit/9d865f7536ae6feda6fba77785e4548f95ca5d03)

Source/Game/Spells/Auras/AuraEffect.cs

@@ -2799,7 +2799,18 @@ namespace Game.Spells
             }
 
             if (apply)
+            {
+                target.AddUnitFlag(UnitFlags.Immune);
                 target.GetThreatManager().EvaluateSuppressed();
+            }
+            else
+            {
+                // do not remove unit flag if there are more than this auraEffect of that kind on unit
+                if (target.HasAuraType(GetAuraType()))
+                    return;
+
+                target.RemoveUnitFlag(UnitFlags.Immune);
+            }
         }
 
         [AuraEffectHandler(AuraType.DamageImmunity)]

Source/Game/Spells/Spell.cs

@@ -4365,6 +4365,13 @@ namespace Game.Spells
             if (m_caster.ToUnit() && !m_caster.ToUnit().IsAlive() && !m_spellInfo.IsPassive() && !(m_spellInfo.HasAttribute(SpellAttr0.CastableWhileDead) || (IsTriggered() && m_triggeredByAuraSpell == null)))
                 return SpellCastResult.CasterDead;
 
+            // Prevent cheating in case the player has an immunity effect and tries to interact with a non-allowed gameobject. The error message is handled by the client so we don't report anything here
+            if (m_caster.IsPlayer() && m_targets.GetGOTarget() != null)
+            {
+                if (m_targets.GetGOTarget().GetGoInfo().GetNoDamageImmune() != 0 && m_caster.ToUnit().HasUnitFlag(UnitFlags.Immune))
+                    return SpellCastResult.DontReport;
+            }
+
             // check cooldowns to prevent cheating
             if (!m_spellInfo.IsPassive())
             {

Source/Game/Spells/SpellEffects.cs

@@ -1324,6 +1324,10 @@ namespace Game.Spells
             if (gameObjTarget != null)
             {
                 GameObjectTemplate goInfo = gameObjTarget.GetGoInfo();
+
+                if (goInfo.GetNoDamageImmune() != 0 && player.HasUnitFlag(UnitFlags.Immune))
+                    return;
+
                 // Arathi Basin banner opening. // @todo Verify correctness of this check
                 if ((goInfo.type == GameObjectTypes.Button && goInfo.Button.noDamageImmune != 0) ||
                     (goInfo.type == GameObjectTypes.Goober && goInfo.Goober.requireLOS != 0))