Determine if status list invocation target can be computed using `baseUrl` from config instead of `/status-lists/` search/replace

[dlongley]

See: https://github.com/digitalbazaar/bedrock-vc-issuer/blob/v28.4.0/lib/ListSource.js#L38-L42

This code takes the status list VC ID and uses it to compute the endpoint for creating the status list, based on an assumption that the VC ID might use a different public/external URL than an internal one (with a proxy in place to point the external one to the internal one). The way it does the computation today is by searching for the last /status-lists/ path component in the VC ID, but instead, we could perhaps use the baseUrl from the instance's status list configuration. This would not remove the requirement for the baseUrl to end in /status-lists, but it might be a cleaner computation.