Changes to Edit a milestone

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 409

added the new test_outside_plan_project enum value to the error/code response property for the response status 422

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 409

removed the test_outside_plan_project enum value from the error/code response property for the response status 422