The flakiness entry, with the numbers that closed it

The flakiness entry, with the numbers that closed it Records what the cause turned out to be — 85 unsettled navigations, 30 of them in one file — and the before/after, including that it is a reduction rather than a cure. The entry previously pointed at `browse.e2e.ts` as the place to start looking, which was right for the wrong reason: that file was not flakier, it just had the most navigations.