Changes to Get All Schools Analytics

added the optional property schools/items/pending_students to the response with the 200 status

added the optional property total_pending_students to the response with the 200 status

added the new optional query request parameter school_year

added the optional property available_school_years to the response with the 200 status

added the required property school_year to the response with the 200 status

the response property schools/items/school_domain became optional for the status 200

response property schools/items/school_domain list-of-types was widened by adding types null to media type application/json of response 200