consolidate GPU test and publish

[Borda]

🚀 Feature

Let's re-consider the advantage of running pytest (e.g. pytest -v notebook.ipynb --nbval) since notebooks in most cases do not include any real pytest case (well, I do not see any)

Pitch

simplify the CI/CD processes

Alternatives

adding at least fail fast for pytest-nbval

Additional context

as a disadvantage, it tries to execute all related cell not fail fast which:

• marked looking for the issue harder as there is too much noise
• in most cases when the first failing cell hits, no others are passing because of missing expected imports or variables

[speediedan]

Makes sense since the testing was adding minimal marginal value over the publish pipeline. Totally on board with that simplification!

[Borda]

done in #324