update test_utils#1752
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RamilCDISC
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The PR updates test_utils subprocess command to use environment which write b ack to parent process and in proper readable format. The passing CI ensures that the changes integrate properly.
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Fixed Windows-specific subprocess failures in test_utils.py by setting PYTHONUNBUFFERED=1 and PYTHONUTF8=1 in the child process environment.
Environment changes are applied to a copy of the parent environment to avoid mutation.