remove files that are no longer used
update to determine if consented #3560

Use the most recent consent to determine if the
participant has consented
Re-work logic for consented? #3560

For determining if the participant is consented?
reconsented? or withdrawn?

or consented to sample collection

we use the most recent ParticipantConsent record to
determine consent.

Missing from this commit is a test if the most recent
consent has sample consents and if this is not
true (and consent is given) to check the previous
consent's sample consent records.