[Services] Status code categories could be confused with timing data

[philliphoff]

In some scenarios, the status code categories (e.g. 200s, 300s, etc.) could get confused with timing data as they have very similar styling in the HUD.

In the screenshot, it almost looks like there was one request that took 200 seconds (i.e. 200s) in addition to the one that took 352ms:

Maybe we should try to differentiate the summaries a bit more?