List conversation previews

Deprecated: use discovery.conversation-previews.list.v2 (discovery_conversation_previews_list_v2), which answers the results window its previews read in scope.window; this version lists the same previews and names in scope.dispatchId the newest run that measured a conversation of the window's last 30 days. List the newest conversations of a campaign's results window as previews, at most 12, optionally narrowed to segments: each customer's name and job title or age, the assistant, when it happened, the brands it named and their role, and its first turns. Of those, the ones held in the campaign's language come first, newest first within each group: the campaign's language is its profile's, else English, and a customer who declares no language speaks it. A campaign without results answers its state and no previews. Page through and search every conversation with discovery.conversations.list.