do not leak email to other users

functions/api/lib/converter/request_response/user.dart

@@ -2,13 +2,11 @@ import 'package:lib/lib.dart';
 import 'package:api/model/user.dart';
 
 class UserRequestResponseConverter {
-  static const String emailRequestResponseFieldName = "email";
   static const String nameRequestResponseFieldName = "name";
   
   static Map<String, dynamic> toResponseData(User response) {
     return {
       RequestResponseVariables.idFieldName: response.id,
-      emailRequestResponseFieldName: response.email,
       nameRequestResponseFieldName: response.name,
     };
   }