Changes to GET `/api/v0/main-frontend/credit-registration-admin/pipeline-history` - Daily queue depth per ledger state, with what entered and left each state that day, and the count per timeline step and the Needs attention count from the day those snapshots began.

added the optional property days/items/needs_attention_count to the response with the 200 status

added the required property days/items/steps to the response with the 200 status

added the new partially_registered enum value to the days/items/states/items/state response property for the response status 200

added the new pending enum value to the days/items/states/items/state response property for the response status 200

removed the abandoned_by_consent_withdrawal enum value from the days/items/states/items/state response property for the response status 200

removed the pending_consent enum value from the days/items/states/items/state response property for the response status 200

removed the pending_prerequisites enum value from the days/items/states/items/state response property for the response status 200

removed the pending_student_number enum value from the days/items/states/items/state response property for the response status 200

endpoint added