bridgetest: automate graphing the results
Cohosh made some manual graphs showing some of the data points coming out of the bridgetest docker image. That's great but I bet it will be no fun to do new manual graphs every time.
One of Shadow's huge features is that part of running a Shadow experiment is that it writes out a many-page pdf with automatic snazzy graphs of cdfs of bandwidth, latency, all the rest. So, check out how Shadow does its thing.
Especially if we end up wanting to do more involved logic, like the "don't show any results for bridges that Canada couldn't reach" idea from #40019, we're going to want this "output analysis" step to be automated and repeatable.