remove no-setuptools config option

[dimbleby]

it is currently mildly inconsistent that poetry defaults to installing setuptools in newly created environments, but then removing it at poetry install --sync

the direction of travel is that setuptools should be named as an explicit dependency if required, let's go there

• remove the config option
• don't install setuptools

maybe one for #9136 if that's going to be a thing, though personally I would not be too frightened of releasing this anyway, so long as it gets a suitable mention in the changelog

[edmorley]

Given that poetry install --sync immediately removes setuptools from any Poetry-created venv, this seems fine to merge before Poetry v2? And it would be in alignment with:

• gh-95299: Stop installing setuptools as a part of ensurepip and venv python/cpython#101039
• Stop installing setuptools and wheel by default on Python 3.12+ environments pypa/virtualenv#2487
• Stop installing setuptools and wheel on Python 3.12+ pypa/get-pip#218
• Stop installing setuptools in python 3.12+ docker-library/python#954
• Remove setuptools & wheel from seed packages (#1602) astral-sh/uv#1613

[Secrus]

@dimbleby could you please rebase?

[dimbleby]

@dimbleby could you please rebase?

@Secrus there are no merge conflicts, you can just hit the "rebase and merge" button

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.