Core/Auras: Added serverside checking for UNIT_FLAG_PACIFIED when attempting to start melee attack

Closes #8623

src/server/game/Entities/Unit/Unit.cpp

@@ -8914,6 +8914,9 @@ bool Unit::Attack(Unit* victim, bool meleeAttack)
     if (GetTypeId() == TYPEID_PLAYER && IsMounted())
         return false;
 
+    if (HasFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_PACIFIED))
+        return false;
+
     // nobody can attack GM in GM-mode
     if (victim->GetTypeId() == TYPEID_PLAYER)
     {

src/server/game/Spells/Auras/SpellAuraEffects.cpp

@@ -2301,7 +2301,10 @@ void AuraEffect::HandleAuraModPacify(AuraApplication const* aurApp, uint8 mode,
     Unit* target = aurApp->GetTarget();
 
     if (apply)
+    {
         target->SetFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_PACIFIED);
+        target->AttackStop();
+    }
     else
     {
         // do not remove unit flag if there are more than this auraEffect of that kind on unit on unit