Currently, in case of a huge number of visits for an origin, this makes the page
querying that result crash (when the cache is initially empty, and even with a populated
cache, that could take some time).
With this diff, instead of iterating over all origin visits, this uses simpler storage
api calls to retrieve the most recent visit (and the most recent associated visit
status). This also no longer relies on the cache of all visits for that origin.
Related to T3905