:man_farmer: `UNIT_Server_TEST` flaky on Citadel + MacOS

[Blast545]

Environment

• OS Version: homebrew buildfarm
• Source, this job: https://build.osrfoundation.org/job/ignition_gazebo-ci-ign-gazebo3-homebrew-amd64

Test  #25: UNIT_Server_TEST .....................................***Exception: SegFault  8.12 sec

Description

• Expected behavior: The tests pass
• Actual behavior: Sometimes they fail

Steps to reproduce

1. Run a buildfarm gz-sim3 homebrew job
2. Repeat step 1 until you see the error appearing.

Additional (reference) info

I have seen these two tests flakily segfaulting:

https://github.com/gazebosim/gz-sim/blob/dc5f117da91b19611bc244dd1ecbb04fc858140d/src/Server_TEST.cc#L681 https://github.com/gazebosim/gz-sim/blob/dc5f117da91b19611bc244dd1ecbb04fc858140d/src/Server_TEST.cc#L721

The flaky nature and the fact that it's segfaulting while setting up the server, makes me think it's related to: https://github.com/gazebosim/gz-sim/issues/630

Reference jobs

https://build.osrfoundation.org/job/ignition_gazebo-ci-ign-gazebo3-homebrew-amd64/222/ https://build.osrfoundation.org/job/ignition_gazebo-ci-ign-gazebo3-homebrew-amd64/219/ https://build.osrfoundation.org/job/ignition_gazebo-ci-ign-gazebo3-homebrew-amd64/211/