"Anti test: Detecting UDP leaks of DNS lookups with the firewall leak detector" fails on Jenkins

It started failing a few days ago. I suspect that’s caused by the DDoS mitigations but let’s investigate. Possible outcomes: mark the test as fragile, fix the infra, call this an actual bug in Tails or its test suite.

Related issues

Blocks #13241 (closed)
Blocks #13242

Original created by @intrigeri on 16351 (Redmine)

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