Update show raw log icon button

What does this MR do and why?

Update show raw job log icon button

• Matches Open raw button on files
• Relevant Slack thread

Screenshots or screen recordings

Before	After

How to set up and validate locally

Go to job log (ie http://localhost:3000/gitlab-org/gitlab-test/-/jobs/993)

UX Paper Cuts 16.4 → Pipelines and Jobs (#408231 - closed)