Explicit CLI check does not work on Windows as part of GH action

[phackstock]

As discovered in #300, trying to explicitly call nomenclature as a subprocess does not work out of the box in Windows.

It might be related to the fact that we are using poetry and as detailed here: https://github.com/marketplace/actions/install-poetry-action#running-on-windows there are some extra steps necessary to get poetry to play nice with Windows in the first place.

It seems though as if the issue is not with installing nomenclature as a cli option itself.