This function verifies whether the required system variables (`NETTSKJEMA_CLIENT_ID` and `NETTSKJEMA_CLIENT_SECRET`) are set to enable authentication with the Nettskjema API. It provides feedback on the setup status and returns whether the system is correctly configured.
Usage
ns_has_auth(
client_id = Sys.getenv("NETTSKJEMA_CLIENT_ID"),
client_secret = Sys.getenv("NETTSKJEMA_CLIENT_SECRET")
)