wpt.fyi experimental runs check too lenient

[foolip]

@stephenmcgruer noticed in web-platform-tests/wpt#19975 (comment) that https://ecosystem-infra-rotation.appspot.com/ isn't reflecting the current problem with old Edge Dev results. (I assumed that it did but didn't check.)

The problem is here:
https://github.com/foolip/ecosystem-infra-rotation/blob/3a52deb7efc4caeede433b58e850623d681737aa/webapp/components/ecosystem-infra-rotation.html#L116-L125

Because the run end time is used, the check passes because the now most recent Edge Dev run started quite long after the commit itself.

Unfortunately, we don't store the commit time. web-platform-tests/wpt.fyi#310 was about this and mostly resolved by web-platform-tests/wpt.fyi#349, but it doesn't really help if the run itself starts very late, as was the case here.

Another issue here is that each run is checked individually so this check can pass even if there aren't any aligned runs.

[foolip]

Also need to check for WebKitGTK runs.

[stephenmcgruer]

We added WebKitGTK in #28