Firewall rules: highlight rules on non-existent zones

[gsanchietti]

Currently, firewall rules configured for zones that no longer exist are silently ignored. This can lead to confusion and potential security misconfigurations. To improve user awareness and system management, we might add a visual indicator (such as a warning icon) next to these inactive rules in the firewall rules page.

Other possible improvements:

• allow the deletion of all zones, including the standard ones
• alert the user when a zone is deleted and list all rules using the zone

Community discussion: https://community.nethserver.org/t/nethsecurity-suspected-minor-bugs/24471/7?u=andre8244

[stephdl]

QA
test image
create 3 rules (forward, input, output) in the firewall with a custom zone Foo
the 3 rules are displayed without issue
disable the three rules, you have a disabled badge (state grayed disabled) and a tooltip when you have your mouse over
delete the custom zone
the three rules are displayed with an inactive badge (state grayed disabled) and a tooltip when you have your mouse over
the inactive zone state wins over the disabled state, you can disabled a rule with a deleted zone, you will still have an inactive rulle badge

[gsanchietti]

Verified with image 23.05.5-ns.1.4.1-14-g490620e1f