Expose runners status information in job api

What does this MR do?

Expose the project runner information in jobs/:id.json response. This translates the haml template into json to be used inside of vue, more detail can be found in gitlab-org/gitlab-ce#51273 and for context check out gitlab-org/gitlab-ce#50101

What are the relevant issue numbers?

gitlab-org/gitlab-ce#51273

gitlab-org/gitlab-ce#50101

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #51273 (closed)