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

extensions/azurecore/src/test/stubs/credentialsTestProvider.ts

@@ -1,33 +0,0 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) Microsoft Corporation. All rights reserved.
- *  Licensed under the Source EULA. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
-
-import * as azdata from 'azdata';
-
-/**
- * Mock CredentialsProvider to be used for testing
- */
-export class CredentialsTestProvider implements azdata.CredentialProvider {
-	handle: number = 0;
-
-	public storedCredentials: { [K: string]: azdata.Credential } = {};
-
-	saveCredential(credentialId: string, password: string): Thenable<boolean> {
-		this.storedCredentials[credentialId] = {
-			credentialId: credentialId,
-			password: password
-		};
-		return Promise.resolve(true);
-	}
-
-	readCredential(credentialId: string): Thenable<azdata.Credential> {
-		return Promise.resolve(this.storedCredentials[credentialId]);
-	}
-
-	deleteCredential(credentialId: string): Thenable<boolean> {
-		let exists = this.storedCredentials[credentialId] !== undefined;
-		delete this.storedCredentials[credentialId];
-		return Promise.resolve(exists);
-	}
-}