Changes to Read a workspace's plan, seats, and usage overview

added the new test_outside_plan_project enum value to the error/code response property for the response status 400

added the new test_outside_plan_project enum value to the error/code response property for the response status 401

added the new test_outside_plan_project enum value to the error/code response property for the response status 403

added the new test_outside_plan_project enum value to the error/code response property for the response status 404

added the new test_outside_plan_project enum value to the error/code response property for the response status 500

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

removed the required property purchased_seats from the response with the 200 status

removed the test_outside_plan_project enum value from the error/code response property for the response status 400

removed the test_outside_plan_project enum value from the error/code response property for the response status 401

removed the test_outside_plan_project enum value from the error/code response property for the response status 403

removed the test_outside_plan_project enum value from the error/code response property for the response status 404

removed the test_outside_plan_project enum value from the error/code response property for the response status 500