Updates the Tailwind migration script so that Prettier can be run after
the migrations. This gives us a chance to commit the changes right after
the migrations and before the CSS utils get re-ordered, which might make
diffs confusing.

feat: make Tailwind migrations a 2-steps process

See merge request gitlab-ui!4453



Merged-by: Peter Hegman <phegman@gitlab.com>
Approved-by: Peter Hegman <phegman@gitlab.com>
Co-authored-by: Paul Gascou-Vaillancourt <paul.gascvail@gmail.com>

# [87.4.0](gitlab-ui@v87.3.1...v87.4.0) (2024-07-30)

### Features

* make Tailwind migrations a 2-steps process ([b148f2ba](gitlab-ui@b148f2ba))