Remove unused files in sql and extensions folders (#22444)

extensions/machine-learning/src/types.ts

@@ -1,22 +0,0 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) Microsoft Corporation. All rights reserved.
- *  Licensed under the Source EULA. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
-
-const _typeof = {
-	undefined: 'undefined'
-};
-
-/**
- * @returns whether the provided parameter is undefined or null.
- */
-export function isUndefinedOrNull(obj: any): boolean {
-	return isUndefined(obj) || obj === null;
-}
-
-/**
- * @returns whether the provided parameter is undefined.
- */
-export function isUndefined(obj: any): boolean {
-	return typeof (obj) === _typeof.undefined;
-}