Migrate to Pajamas compliant button in CI/CD settings page

Related to #417861 (closed)

What does this MR do and why?

The button in ee/app/views/groups/settings/ci_cd/_protected_environments.html.haml is not Pajamas compliant. This MR migrates that to be compliant with Pajamas components.

Screenshots or screen recordings

No visual changes

How to set up and validate locally

1. Visit the group ci/cd settings page Example: http://gdk.test:3000/groups/gitlab-org/-/settings/ci_cd

2. Verify the expand button next to "Protected environments" section

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.