Follow-up from "feat: Add Device Auth Support"

Summary

Remove gl-justify-content-left class usages. They are not defined so have no effect.

Follow up context

The following discussion from !155622 (merged) should be addressed:

• @svedova started a discussion: (+3 comments)

  suggestion I'm not sure gl-justify-content-left is a valid tailwind / gitlab utility. Did you mean gl-justify-start maybe?