Add progress ring in 'stop evaluation' button

[charisk]

Adds a progress ring in to the "Stop evaluation" button to match the "designs".

stop-evaluation-progress.mov

Checklist

N/A:

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[shati-patel]

Thanks for putting a ring on it! 💃🏽 💍