Add more origins to savecodenow::e2e.
This will reduce the number of visits on the tested origins, by randomly selecting one to submit to SCN, instead of always visiting the same one.
Because of the current performance of swh-storage, having too many visits for the same origin causes timeouts.
Depends on D8544.
Fixes T4386#91104
Migrated from D8546 (view on Phabricator)