[client] Add disable system flags

[lixmal]

Describe your changes

New cli flags:

      --disable-client-routes           Disable client routes. If enabled, the client won't process client routes received from the management service.
      --disable-dns                     Disable DNS. If enabled, the client won't configure DNS settings.
      --disable-firewall                Disable firewall configuration. If enabled, the client won't modify firewall rules.
      --disable-server-routes           Disable server routes. If enabled, the client won't act as a router for server routes received from the management service.

Issue ticket number and link

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
1 Accepted issue

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.6% Duplication on New Code

See analysis details on SonarQube Cloud