Add Windows-specific CREATE_NO_WINDOW flag for test subprocesses #30879
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This pull request makes the test subprocess helper a bit smarter on Windows to avoid spurious timeouts.
Added subprocess section in subprocess_run_for_testing function
Modified subprocess section
This change updates subprocess_run_for_testing so that, on Windows, it runs test subprocesses with the CREATE_NO_WINDOW flag. This prevents console windows from being created for every subprocess, which can contribute to the hanging and timeout behavior seen in the Windows test runs. The new behavior is guarded by sys.platform == "win32" and merges CREATE_NO_WINDOW with any existing creationflags, so non‑Windows platforms and callers that already pass creationflags keep their current behavior.
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