Add Data Validation to the PUT /facilities/{id} Endpoint

The implementation of PUT /facilities/{id} includes this line of code:

boolean addSuccessful = addSupportedProgramsToFacility(facilityDto.getSupportedPrograms(), facilityToSave);

This line fails when clients provide a request body which lacks an array of supportedPrograms. For example, this request body will cause a NullPointerException at the aforementioned line:

{
"id": "e6799d64-d10d-4011-b8c2-0e4d4a3f65ce",
"active": true
}

This ticket may be considered complete when the NullPointerException is no longer thrown. The "putShouldReturnBadRequestForNonExistentSupportedProgram" test suggests that a 400 error should instead be returned by throwing a ValidationMessageException with a key/message describing the validation exception.