Split testing workflows

[spossann]

Avoid code copying in testing. Use actions.

[max-models]

Are all the tests from the previous pipeline covered here? It looks like they are to me at least, this is much cleaner than what we had before.

[spossann]

Are all the tests from the previous pipeline covered here? It looks like they are to me at least, this is much cleaner than what we had before.

yes all the test previously in testing.yml are performed here, split in three separate workflows.