Add a specific throttling scope for api_origin_visit_latest.
This function will get called a lot (by default, up to 70 times per origin search), so it deserves a much higher rate-limit.
Related diffs: !153 (closed) !154 (closed) swh/infra/puppet/puppet-swh-site!190 (closed)
Migrated from D1712 (view on Phabricator)