feat: unique email addresses of participants unless child, cleanup

addresses #869axbn21

src/Form/Service/EditFieldStateProvider.php

@@ -11,7 +11,6 @@ use App\Form\Service\Condition\ApplicantCondition;
 use App\Form\Service\Condition\CompositeCondition;
 use App\Form\Service\Condition\DateOfBirthProvidedCondition;
 use App\Form\Service\Condition\FieldValueCondition;
-use App\Form\Service\Condition\InsuranceMutabilityCondition;
 use App\Form\Service\Condition\MutabilityCondition;
 use App\Form\Service\Condition\PickupsMutabilityCondition;
 use App\Form\Service\Condition\RentalSelectionCondition;