make wf_id optional on normalize_collaborations

[DonHaul]

While working on normalize_collaborations we've noticed that the the wf_if is being passed through to /curation/literature/collaborations-normalization for the sole purpose of logging.

PS: We could also completely remove it although this might be a bit trickier to do. Discuss First

Actions:

• Make it an optional parameter for this endpoint
• set it by default to -1 in normalize_collaborations

[drjova]

@DonHaul I would suggest, default to be None to avoid hardcoded values and clarity.