Update learner exam assignment and links on record

Learner records miss assigned exam links after randomisation, leaving instructors without prep context. It writes exam links and numbers to records so coordinators see details same day.

Overview

When randomized exam selections don't land on learner records, coordinators and instructors lose prep time and clarity. This flow writes exam links and identifiers directly to the learner profile, giving coordinators full exam context same day and reducing scheduling friction.