test: cover module entrypoint

[theamodhshetty]

Summary

• add a focused regression test for the python -m poetry module entrypoint
• assert the entrypoint delegates to poetry.console.application.main() and exits with its status code

Tests

• .venv/bin/python -m pytest tests/test_main.py -n 0

Relates-to: #3155

[sourcery-ai]

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