Small refactor to remove rubocop disable

Terri Churequested to merge
tchu-refactor-datamigrationservicespec into master

What does this MR do and why?

Discussion: !119786 (comment 1380153447)

Small refactor to remove rubocop disable and add a comment about why the code is needed

Screenshots or screen recordings

N/A

How to set up and validate locally

specs only change

MR acceptance checklist

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