Core/Spell: reimplemented TRIGGERED_DISALLOW_PROC_EVENTS trigger flag

Triggered spells shouldn't chain-trigger other spells

Closes #18217

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

@@ -10730,6 +10730,11 @@ void Unit::TriggerAurasProcOnEvent(Unit* actionTarget, uint32 typeMaskActor, uin
 
 void Unit::TriggerAurasProcOnEvent(ProcEventInfo& eventInfo, AuraApplicationProcContainer& aurasTriggeringProc)
 {
+    Spell const* triggeringSpell = eventInfo.GetProcSpell();
+    bool const disableProcs = triggeringSpell && triggeringSpell->IsProcDisabled();
+    if (disableProcs)
+        SetCantProc(true);
+
     for (auto const& aurAppProc : aurasTriggeringProc)
     {
         AuraApplication* aurApp;
@@ -10748,6 +10753,9 @@ void Unit::TriggerAurasProcOnEvent(ProcEventInfo& eventInfo, AuraApplicationProc
         if (spellInfo->HasAttribute(SPELL_ATTR3_DISABLE_PROC))
             SetCantProc(false);
     }
+
+    if (disableProcs)
+        SetCantProc(false);
 }
 
 SpellSchoolMask Unit::GetMeleeDamageSchoolMask() const