Core/Spells: Fixed SPELL_ATTR0_UNAFFECTED_BY_INVULNERABILITY not being checked in some places where IsImmunedToSpell is not called

Closes #9362
Code by @joschiwald

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

@@ -11131,6 +11131,9 @@ bool Unit::IsImmunedToSpellEffect(SpellInfo const* spellInfo, uint32 index) cons
     if (!spellInfo || !spellInfo->Effects[index].IsEffect())
         return false;
 
+    f (spellInfo->Attributes & SPELL_ATTR0_UNAFFECTED_BY_INVULNERABILITY)
+        return false;
+        
     // If m_immuneToEffect type contain this effect type, IMMUNE effect.
     uint32 effect = spellInfo->Effects[index].Effect;
     SpellImmuneList const& effectList = m_spellImmune[IMMUNITY_EFFECT];