Fixes order of buttons in merge request widget

What does this MR do and why?

Fixes the order of the buttons in the merge request widget state components

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

• Visit a merge request with a unresolved discussion
• See widget buttons
  • The primary button should be right aligned but 1st in the DOM

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 #376029 (closed)