Migrate `gl-vertical-align-middle` legacy CSS util

Peter Hegmanrequested to merge
456643-css-utilities-tg-vertical-align-migrate-to-tailwind-css-2 into master

What does this MR do and why?

Related to #456643 (closed), #456594 (closed)

The CSS utils task group is in the process of migrating legacy CSS utilities to the Tailwind equivalent. This MR migrates gl-vertical-align-middle to gl-align-middle and gl-vertical-align-middle! to !gl-align-middle(https://tailwindcss.com/docs/vertical-align). They use the exact same CSS properties so we just need to change the name of the actual util.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before After
Screenshot_2024-04-22_at_9.58.44_PM Screenshot_2024-04-22_at_9.57.53_PM

How to set up and validate locally

  1. Go to a group -> Manage -> Members
  2. Inspect any cell in the table, the !gl-align-middle class should be working
Edited by Peter Hegman

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