removed unused import

Author: gmmorris

x-pack/plugins/oss_telemetry/server/lib/tasks/visualizations/task_runner.test.ts

@@ -4,7 +4,6 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import moment from 'moment';
 import {
   getMockCallWithInternal,
   getMockConfig,