installer: report more details on build failures #8479
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Yesterday, I was able to reproduce errors similar to #7611 in python-poetry/poetry-plugin-export#235 for a short time. (After a few runs it suddenly stopped to reproduce.)
Nevertheless, I think I gained a few new insights: The build backend is not available in the isolated venv because the installation of the build system requirements failed! Up to now, we did not check the result of the installation. (I do not know yet why the installation fails because the issue stopped to reproduce after I added additional output.)
In order to provide better error messages and facilitate future investigations, this PR checks the return code of the installation of build system requirements and prints additional information in case of failure.