refactor: use virtual environment to be consistent

[SMoraisAnsys]

Following the work on #543, it seems that there was a need for three things:

• better handling of unexpected behavior when working with VMs, see Errors when working in a VM #559;
• better coherence in how we deal with poetry and pip build backends;
• better handling of the corner case where poetry and the project have shared dependencies with different versions.

This PR aims at tackling those three points by enforcing the use of a virtual environment, even when working with poetry.

On top of those changes, the modified actions are now "more compatible" with poetry. Before, the default behavior was to use python -m pip install . while now we detect the build backend and use poetry if appropriate.

Note: following @Andy-Grigg comments, we use a "hack" to ensure that poetry and the project are not installed in the same environment and thus don't clash with each other if they share common dependencies with different version. The idea is to use pipx to install poetry in a temp folder cleaned up before and after running each job. The only side effect is for VMs as pipx will still be here afterward.

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[RobPasMue]

Overall LGTM - just a minor comment

[SMoraisAnsys]

This worked as expected for:

• https://github.com/ansys/pyansys-sound/actions/runs/10937085524
• https://github.com/ansys/pyconceptev/actions/runs/10936996838?pr=122
• https://github.com/ansys-internal/pyaedt-examples/actions/runs/10917092741?pr=230

[RobPasMue]

You sure had some fun in this PR @SMoraisAnsys 😄

[RobPasMue]

LGTM! Some minor comments

[Andy-Grigg]

Poetry should be installed in a separate virtual environment to the project that's being tested/built, to avoid situations in which both poetry and the project have dependencies on different versions of the same package. I've included an approach that uses pipx to get around this.

@ludovicsteinbach I know you originally raised this topic about poetry support across all actions. Can you take a look as well please?

[Andy-Grigg]

The changes look good to me. Thanks!

[SMoraisAnsys]

The changes look good to me. Thanks!

I need to double check with some testing though :) Thanks again for the feedback !

[SMoraisAnsys]

Test closing this PR due to workflow problem

[jorgepiloto]

Thanks for the big effort here, @SMoraisAnsys. Approving. Just left one comment.