Disable health checks on Prowlarr -- the synced-app testall endpoint
requires Sonarr/Radarr to reverse-connect to prowlarrUrl, which is
unreachable across the wg namespace boundary.
Also add networkNamespaceService = "wg" for the new configurable
namespace service dependency (replaces old hardcoded wg.service).
Simon Gardling
2c67b9729b