[client] Exclude loopback from NAT

[lixmal]

Describe your changes

This fixes an issue with the ebpf proxy port being changed by the nat rules

-A NETBIRD-RT-NAT -i wt0 ! -o lo -j MASQUERADE
-A NETBIRD-RT-NAT ! -i lo -o wt0 -j MASQUERADE

       chain netbird-rt-postrouting {
                type nat hook postrouting priority srcnat - 1; policy accept;
                iifname "wt0" oifname != "lo" counter packets 0 bytes 0 masquerade
                oifname "wt0" iifname != "lo" counter packets 0 bytes 0 masquerade
        }

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
0 Accepted issues

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

See analysis details on SonarCloud