Launch a fact-find session as an adviser on behalf of a client.

This endpoint allows an adviser to launch a fact-find session for one of their clients. On success, the adviser is redirected to the client portal with a 6-hour authenticated session. The session data will include a launched_by_account_uuid to identify the adviser.

The client portal can then fetch the session data via the public API endpoint: GET /api/v2/fact-find-launch/{factFindSessionUuid}