Follow up Folio adapter test data

[kenoir]

Follows: #6247

We have a Folio adapter, we want to test it harvests data and can pick up additions, modifications and deletions.

We should work with Collections Product Lines to:

• Create a data import to exercise harvest within a known window
• Make modification to tests additions, modifications and deletions

[kenoir]

This is complete when we've documented receiving deletions from Folio via OAI-PMH and also noticing suppressed records via MARC (proxy deletions).