Clean up some of the extensions (#8267)

* 💄

* prune unused code

* more cleanup

* remove abunch of used code

extensions/integration-tests/src/index.ts

@@ -10,7 +10,7 @@ import { SuiteType, getSuiteType } from 'adstest';
 
 import { context } from './testContext';
 
-import path = require('path');
+import * as path from 'path';
 
 const suite = getSuiteType();