removes PpgDetails from participant #3550

Included the removal of ppg_details (and its 
auto-generated ppg_status_history) from the 
participant in #make_ineligiible.
private methods should be private #3550
Merge pull request #71 from NUBIC/bug_3550_eligibility_adjudicator_does_not_remove_ppgdetails_for_removed_participant_records

removes PpgDetails from participant #3550