Add machine type in the artifact of Examples directory job
# What does this PR do?

We have
<img width="257" alt="Screenshot 2022-08-03 174611" src="https://user-images.githubusercontent.com/2521628/182652043-02a031a1-c8b9-457a-8876-130a37099075.png">
even when there are some errors in `Examples directory` test.

(relevant run: https://github.com/huggingface/transformers/actions/runs/2786567567)

Adding the machine type (single-gpu / multi-gpu) in the artifact names should make things work.
_The documentation is not available anymore as the PR was closed or merged._<|||||>(I should have run the job and make sure it works before requesting review - ending up a few more commits to fix things, sorry)