fix: stop logging an empty artifact server if the address is inferred

What does this MR do?

The artifact server is now inferred from the gitlab server, if that happens Pages log the empty artifact-server flag.

This MR updates the code to log the final/correct artifact server url.

TODO

• I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines