List dispatch setups

The caller's saved dispatch setups across every jurisdiction, most recently created first, each with up to three of its most recent accessible dispatches. Setups are jurisdiction-scoped, so the gateway asks every jurisdiction's cell and merges; a page is the union of one cell page per jurisdiction — ordering is newest-first WITHIN a page, not across pages — so it can be longer OR shorter than pageSize (entire-api also masks a setup's config to the repos the caller can see and drops a setup whose repos are all gone) without meaning the list is exhausted — page until nextPageToken is null. A jurisdiction whose cell didn't answer is named in unavailableJurisdictions.