chore(CSS): Remove `deprecate_utils.js` script
What does this MR do?
Closes #2508 (closed)
In !3925 (merged) we added a script to prefix legacy CSS utils with gl-deprecated-
. This was the original plan for the Tailwind CSS migration but we have since pivoted to https://docs.gitlab.com/ee/architecture/blueprints/tailwindcss/#design-and-implementation-details and this script is no longer needed. This MR removes the script.
Integration merge requests
Not needed, this is a developer facing change that won't affect consuming projects
Edited by Peter Hegman