Try firewalled test

[Dreamsorcerer]

This will allow us to stop network access in the tests, which breaks downstream testing and introduces flakiness.

This is audit mode only currently, so just testing out performance etc. right now.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.96%. Comparing base (4306796) to head (3a383f8).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #12993   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files         131      131           
  Lines       48087    48087           
  Branches     2496     2496           
=======================================
  Hits        47587    47587           
  Misses        376      376           
  Partials      124      124           

Flag	Coverage Δ
Autobahn	22.23% <ø> (ø)
CI-GHA	98.90% <ø> (ø)
OS-Linux	98.66% <ø> (+<0.01%)	⬆️
OS-Windows	97.04% <ø> (-0.01%)	⬇️
OS-macOS	97.94% <ø> (-0.01%)	⬇️
Py-3.10	98.14% <ø> (-0.01%)	⬇️
Py-3.11	98.41% <ø> (ø)
Py-3.12	98.50% <ø> (+<0.01%)	⬆️
Py-3.13	98.47% <ø> (ø)
Py-3.14	98.49% <ø> (+<0.01%)	⬆️
Py-3.14t	97.59% <ø> (+<0.01%)	⬆️
Py-pypy-3.11	97.44% <ø> (-0.01%)	⬇️
VM-macos	?
VM-macos-latest	97.94% <ø> (?)
VM-ubuntu	?
VM-ubuntu-24.04-firewall	98.64% <ø> (?)
VM-ubuntu-latest	98.33% <ø> (?)
VM-windows	?
VM-windows-latest	97.04% <ø> (?)
cython-coverage	38.02% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 83 untouched benchmarks
⏩ 83 skipped benchmarks¹

---

_{Comparing Dreamsorcerer-patch-1 (3a383f8) with master (4306796)²}

Footnotes

1. 83 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on master (7987bd2) during the generation of this report, so 4306796 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩