Update test metadata

[simleo]

• Remove obsolete code
• Add a function to get the workflow's authors

The idea is that the latter will be used to display the workflow's authors in the web app. Example output:

[
    {
        "name": "Josiah Carberry",
        "url": "https://orcid.org/0000-0002-1825-0097"
    },
    {
        "name": "mickeymouse",
        "url": None
    }
]

When available, the value of the "url" field can be used to link to the author's page.