chore(deps): remove nest-typed-config/class-validator resolution
Because: * A resolution pinned class-validator to 0.14.1. * From 0.14.2, validate() without options rejects undecorated classes. This commit: * Removes the resolution and moves root class-validator to ^0.15.1. * Adds top-level decorators to two payments result classes. * Skips the unknownValue check in ModelDataProvider.validate(). Closes FXA-11987