feat: unique email addresses of participants unless child, cleanup

addresses #869axbn21

src/Form/Service/Condition/BookingEligibilityCondition.php

@@ -26,7 +26,7 @@ use App\Service\ParticipantEligibilityService;
 class BookingEligibilityCondition implements FieldConditionInterface
 {
     public function __construct(
-        private readonly ParticipantEligibilityService $participantEligibilityService
+        private readonly ParticipantEligibilityService $participantEligibilityService,
     ) {
     }
 
@@ -36,7 +36,7 @@ class BookingEligibilityCondition implements FieldConditionInterface
      * Returns true when the participant is INELIGIBLE (should hide service fields).
      * Returns false when the participant is eligible (show normal form fields).
      *
-     * @param BookingDto  $bookingDto       The current booking data
+     * @param BookingDto           $bookingDto       The current booking data
      * @param int                  $participantIndex The index of the participant being evaluated
      * @param array<string, mixed> $formData         Current form data for condition evaluation
      *
@@ -71,4 +71,4 @@ class BookingEligibilityCondition implements FieldConditionInterface
     {
         return 'Participant has no available skipasses for their age';
     }
-}
+}