Add ability to show request headers in Highlights (particularly Referrer)

### Problem Statement I regularly find that I look at an Issue, and then have to scroll down the page to the request section, and then expand it and scroll down to find out what the Referrer header is, which is a bit irritating! Some of our endpoints are accessible from multiple different pages, which determines where to start looking for the issue, and I've done this enough times that I've started looking for something to make life easier! ### Solution Brainstorm It would be really helpful if I could add the request Referrer header to the Highlights block at the top! ### Product Area Issues