[FEAT] Try unauthenticated request when Github token is invalid

[mpgxvii]

Is your feature request related to a problem? Please describe.

• Currently, we can specify the Github token to allow authenticated requests to the Github API when pulling questionnaires and protocols.
• However, if this token is invalid, it still attempts to make the request with the incorrect token.

Describe the solution you'd like

• Try unauthenticated request (this is allowed but lower request limits) when the Github token is invalid

Priority
4

Difficulty
4

Additional context
Add any other context or screenshots about the feature request here.

[mpgxvii]

Fixed in #455