Bugfix: Blank user column in event logs

[HalcyonJAC]

Background

This is a follow-up ticket of Investigate Events log#2543.

Feature(s) Description

Implement a fix for the blank user columns in the event logs.

[HalcyonJAC]

Event logs from digital-platform

• The auth field is only populated for Realtime Database triggers and Callable functions. For Background functions, this field is null.

Event logs from apply

• The display name stored in the user token is empty. We can write a node script to update it with the candidate's full name.