Remove unused code (#4873)

* removes unused features

* remove more unused code; formatting

* lock changes

* fix run issue

src/sql/platform/tasks/common/tasks.ts

@@ -2,6 +2,7 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the Source EULA. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
+
 import { IConnectionProfile } from 'sql/platform/connection/common/interfaces';
 
 import * as types from 'vs/base/common/types';