Refactor opsqueue_service to use wait_for_server for port assignment and add utility function for server wait logic

[ReinierMaas]

Refactor opsqueue_service to use wait_for_server for port assignment and add utility function for server wait logic.

[Copilot]

Pull request overview

This PR refactors the test infrastructure to dynamically detect server ports rather than pre-assigning them. The main change introduces a wait_for_server utility function that monitors a process until it starts listening on a port, eliminating the need for the previous random_free_port() approach.

Key Changes:

• Added a new wait_for_server() utility function that polls a process using psutil to detect when it starts listening on a port
• Modified opsqueue_service() to use psutil.Popen instead of subprocess.Popen and dynamically discover the server port via wait_for_server()
• Changed the default port parameter from None to 0, which allows the OS to assign an available port that is then discovered

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
libs/opsqueue_python/tests/util.py	New utility module containing wait_for_server() function with retry logic to wait for a process to start listening on a port
libs/opsqueue_python/tests/conftest.py	Updated opsqueue_service() to use psutil.Popen and call wait_for_server() for dynamic port discovery instead of pre-assigning ports

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[Qqwy]

Nit: old commented code ♻️