updateContactSequenceStatus starts an Apollo background job that changes the
selected contacts across one or more sequences.
automations/stop-apollo-sequence-contacts.automation.ts
contacts and sequences are non-empty reference arrays. mode is
"mark_as_finished" | "remove" | "stop". Optional account selects the
binding. Returns a background-job receipt with jobId, canonical contact and
sequence IDs, mode, current progress, and optional batch size. The receipt means
Apollo accepted the job, not that every change is already complete.