poetry: invoke poetry.console.main instead of using env_script_all_files

[dlh]

Poetry interfaces with virtualenvs, and when PYTHONPATH is set it does not operate correctly.

Our bin/poetry is now functionally the same as the official poetry distribution's bin/poetry.

Relates to #50673, #48883, and python-poetry/poetry#1929.

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I've attached 2 files that show the behavior of poetry add.

• With the current formula, poetry add reports this for the 2 invocations:

Package operations: 5 installs, 11 updates, 0 removals
[...]
Package operations: 6 installs, 16 updates, 0 removals

• With the updated formula in this pull request, poetry add reports this:

Package operations: 16 installs, 0 updates, 0 removals
[...]
Package operations: 6 installs, 0 updates, 0 removals

Note in the current formula, all package are incorrectly updated when the 2nd add is run (poetry add boto3), and some packages are also being incorrectly installed from the vendor'ed lib directory. Additionally, poetry install in the current formula will always re-install every dependency.

This pull request fixes the issue.

current-behavior.txt
fixed-behavior.txt

[Bo98]

Makes sense to me. Seems like a bit of a hack at first with the sys.path stuff but it looks like upstream does exactly the same thing.