Authenticated (user role) remote command execution by modifying `nginx` settings (GHSL-2023-269)

Summary The Home Preference page exposes a small list of nginx settings such as Nginx Access Log Path and Nginx Error Log Path. However, the API also exposes testconfigcmd, reloadcmd and restartcmd. While the UI doesn't allow users to modify any of these settings, it is possible to do so by sendi...