Builds the AssemblyAI webhook callback URL with the sessionId encoded
as a query parameter. AssemblyAI preserves query params on callback,
so this is how the webhook handler routes the response back to the
correct session without a DB lookup on transcript_id.
Builds the AssemblyAI webhook callback URL with the sessionId encoded as a query parameter. AssemblyAI preserves query params on callback, so this is how the webhook handler routes the response back to the correct session without a DB lookup on transcript_id.