[client] Improve icmp conntrack log

[lixmal]

Describe your changes

Example log:

2025-06-12T12:16:10+00:00 TRAC New ingress ICMP connection 100.125.194.240 → 100.125.248.69 (id 0) - DestinationUnreachable(Port) (original: UDP 100.125.248.69:49481 → 100.125.194.240:80)

Issue ticket number and link

Stack

Checklist

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

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