Adds support for level 1 icons in MR widget extensions

What does this MR do and why?

Adds suport for the level 1 status icons in the merge request widget extension component.

Screenshots or screen recordings

How to set up and validate locally

• Open any merge request and the extension should be visible with some test data.

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.

Closes #341042 (closed)