feat: unique email addresses of participants unless child, cleanup

addresses #869axbn21

src/Exception/BookingNotPossibleException.php

@@ -21,4 +21,4 @@ class BookingNotPossibleException extends HttpException
 
         parent::__construct(400, $message, $previous);
     }
-}
+}

src/Exception/BookingSessionNotFoundException.php

@@ -20,4 +20,4 @@ class BookingSessionNotFoundException extends HttpException
 
         parent::__construct(404, $message, $previous);
     }
-}
+}

src/Exception/HotelNotFoundException.php

@@ -23,4 +23,4 @@ class HotelNotFoundException extends HttpException
 
         parent::__construct(404, $message, $previous);
     }
-}
+}

src/Exception/HotelNotInTravelException.php

@@ -24,4 +24,4 @@ class HotelNotInTravelException extends HttpException
 
         parent::__construct(404, $message, $previous);
     }
-}
+}

src/Exception/TravelNotFoundException.php

@@ -23,4 +23,4 @@ class TravelNotFoundException extends HttpException
 
         parent::__construct(404, $message, $previous);
     }
-}
+}