Contact School Site ID is updated when new enrollment is created

the School Site is now serving as the Latest Enrolled Site reference, with an AccountID.

This may be populated/maintained on Salesforce but the API should update it when a new enrollment is created so it's up to date

- [ ] The Latest_Enrolled_Site_Id is retrieved as the Enrollment.Site (AccountID) from the enrollment record
- [ ] The Latest_Enrollent_End_ Date is based on the Enrollment.End_date from the enrollment record
- [ ] The Latest_Enrolled _Site_Name is the Account.name value

to test:
Use the Coach Flow tools Quick Registration to create a new enrollment for an existing student.
Load the student again using Existing or Search in the Quick Reg. The name of the site and date should appear in the results

Dependent App:
https://github.com/AmericaSCORESBayArea/Student-Registration-React-Web/issues/218