For reftests, inline PASS / FAIL into directory views

[foolip]

https://wpt.fyi/results/css/css-flexbox has a lot of reftests where the result is always "1 / 1" or "0 / 1". Drilling down into https://wpt.fyi/results/css/css-flexbox/align-items-004.htm shows PASS or FAIL.

Since reftests have no subtests and can't have failure messages, I believe it'd be better to just inline PASS and FAIL into the directory views. Mockup:

[foolip]

It should still be possible to drill into a single test, however, which for now only provides linkability and no new information. #57 would go there though.

[foolip]

I'd like to expand this to suggest we hoist timeouts, which are currently quite common. These can also happen for testharness.js tests. Mockup using https://staging.wpt.fyi/results/html/dom: