CI: fix test TestNoneNetworkHostName #3960
Merged
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TestNoneNetworkHostName failed on an unrelated build:
https://github.com/containerd/nerdctl/actions/runs/13622696958/job/38074815721#step:8:2329
However, the way the test is currently written prevents useful information from being shown.
This PR rewrite part of it to make it simpler / more sensical and actually show information if it fails.