[backport/1.4] Keep Ping port watcher running after unexpected errors

[joaoantoniocardoso]

This is a backport of #4051 into 1.4.

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Supersedes #4042 (recreated from fork joaoantoniocardoso/BlueOS-docker instead of same-repo head).

[github-actions]

Automated PR Review

0. Summary

• Verdict: LGTM

Straightforward backport of #4051 to 1.4-dev: wraps the PortWatcher.start_watching polling body in a try/except Exception so a transient failure (e.g. KeyError from a network interface disappearing between psutil.net_if_stats/net_if_addrs snapshots in add_ping360) no longer kills the watcher task. Adds a targeted pytest-asyncio regression test and pulls the psutil == 5.7.2 dependency into core/services/ping/setup.py and the root pyproject.toml dev-deps (already used transitively by ping360_ethernet_prober.py and pingutils.py). asyncio.CancelledError is a BaseException in 3.11 so it still propagates and cancellation semantics are preserved — the test correctly asserts this.

No further comments, nice job 👍

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