pip container: Build from Poetry and install wheel (#498)

For some reasons, pip/setuptools was installing
g1_monetary_license directory alongside Silkaj sources
It does not seems to be the case anymore,
I can’t find this information in setuptools changelog

In pyproject.toml, [tool.poetry.include] field is for Poetry usage
There is a way with setuptools I did not manage to make it work
https://setuptools.pypa.io/en/latest/userguide/datafiles.html

Instead, build wheel from Poetry, copy it and install it to Py image

Keep the image standalone, independent from poetry image (#483)
Install Poetry v1 (#499)

Remove unnecessary duplicate ARG argument