feat: make email optional for under-16 participants except applicant

src/Form/Service/CreateFieldStateProvider.php

@@ -21,6 +21,7 @@ use App\Form\Service\Condition\FirstParticipantReadOnlyCondition;
 use App\Form\Service\Condition\MultipleParticipantsCondition;
 use App\Form\Service\Condition\RentalInsuranceAvailableCondition;
 use App\Form\Service\Condition\RentalSelectionCondition;
+use App\Form\Service\Condition\RequiresOwnEmailCondition;
 use App\Form\Service\Condition\RoomSelectionCondition;
 use App\Form\Service\Condition\ServiceSubTypeCondition;
 use App\Form\Service\Condition\SingleRoomTypeCondition;
@@ -112,10 +113,9 @@ class CreateFieldStateProvider extends AbstractFieldStateProvider
             'static_text' => $firstParticipantReadOnlyCondition,
         ];
 
-        // Every participant needs an email address, children included (BPN 650), so
-        // requiredness is the form type's base option and not a condition here.
         $this->fieldStateConditions['email'] = [
             'static_text' => $firstParticipantReadOnlyCondition,
+            'required' => new RequiresOwnEmailCondition(),
         ];
 
         // Mobile field: static text for first participant (when read-only). Mandatory only for the