Add selected state for ellipsis button in last commit

What does this MR do and why?

Changes to close an old MR - !54753 (closed) .

Tasks covered in this MR - !54753 (comment 1050276295)

Screenshots or screen recordings

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Visit http://127.0.0.1:3000/gitlab-org/gitlab-test/-/commits/master
2. Open the ellipsis button an you should be able to see the selected state

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.