tests: Potentially fix flaky TestConfigureNotAttachedHttpListenerOptions #10596
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Description
Potentially fixes the TestConfigureNotAttachedHttpListenerOptions flake. It was noticed that the second test generally took longer to run since the inital connections to the proxy would fail. This could be because the proxy does not come up in time or the DNS cache became out of date, and we would curl the old IP
Similar to 5b41985
Code changes
Ensure the gateway is created once rather than every test as it is common across tests
Context
#10594
Testing steps
Verified that both tests in the suite take the same time to execute which does partially (?) validate the solution
BOT NOTES:
resolves #10594