[Issue]: Add check for new fields to Output-template adding process

[ClaireValdivia]

Why is this issue important?

In Jan 2025, partners reported that the treasury report was generating with several fields blank for all projects. After investigating, we realized that we missed checking for new fields when the template were updated here - #3226

Current State

a PR is in progress to add a test to check that the number of columns #3915

we still need to implement a check for new fields during the process of updating the output templates

Expected State

A check should be added to the output-template adding process that checks if there are any new fields added to the output template, and if they are, adds to the function that generates the output template.

Implementation Plan

The following functions need to be added...

Relevant Code Snippets