Windows CI fixed and add basic import test step in CI

[EtienneLt]

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[obrix]

Maybe linked to the following issue : https://github.com/actions/runner-images/issues/10020

[EtienneLt]

it seems to work

[obrix]

Yes, I think we will be able to remove the workaround once they fix their runner image. Also I added a simple standalone_test.py that only import powsybl and print version to run before the full tests. That was just to debug at first but I am wondering if it could be a good idea to let it in place to be able to quickly see if an issue is related to the whole import and init of pypowsybl or a to a specific test. Any opinion @EtienneLt @geofjamg ?

[obrix]

It looks like the windows image has been fixed.