Core/AI: Replace many Unit::IsHostileTo with Unit::IsValidAttackTarget or Creature::canCreatureAttack.

src/server/game/Spells/Spell.cpp

@@ -1462,9 +1462,7 @@ SpellMissInfo Spell::DoSpellHitOnUnit(Unit* unit, const uint32 effectMask, bool
         if (m_spellInfo->Speed > 0.0f && unit->HasFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_NON_ATTACKABLE) && unit->GetCharmerOrOwnerGUID() != m_caster->GetGUID())
             return SPELL_MISS_EVADE;
 
-        // check for IsHostileTo() instead of !IsFriendlyTo()
-        // ex: spell 47463 needs to be casted by different units on the same neutral target
-        if (m_caster->IsHostileTo(unit))
+        if (m_caster->IsValidAttackTarget(unit))
         {
             unit->RemoveAurasWithInterruptFlags(AURA_INTERRUPT_FLAG_HITBYSPELL);
             //TODO: This is a hack. But we do not know what types of stealth should be interrupted by CC