Make badges in app/views/projects/merge_requests/ Pajamas-compliant

What does this MR do and why?

This MR updates badges in

• app/views/projects/merge_requests/creations/_new_submit.html.haml
• app/views/projects/merge_requests/show.html.haml

to use Pajamas-compliant component

Screenshots or screen recordings

No visual changes. Screenshots for the context:

How to set up and validate locally

1. Create MR and validate the changes between the target and source branches
2. Open an existing MR and validate the tabs

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.

Related to #344333 (closed), #344344 (closed)