feat: pre-flight check of agency bookings

addresses #869bqxr4q

src/Service/ParticipantDataPrefiller.php

@@ -112,15 +112,9 @@ class ParticipantDataPrefiller
 
     /**
      * Checks if the participant's last name triggers dummy data fill.
-     *
-     * Only matches in create mode to avoid accidental triggering during edits.
      */
     public function isDummyDataFillRequested(ParticipantDto $participant, string $mode): bool
     {
-        if (BookingDto::MODE_CREATE !== $mode) {
-            return false;
-        }
-
         return self::TOKEN === $participant->lastName;
     }