Move web playground code into its own extension (#92672)

This splits the web playground out from vscode-api-tests

extensions/vscode-api-tests/src/extension.ts

@@ -0,0 +1,11 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+
+export function activate(_context: vscode.ExtensionContext) {
+	// noop
+}
+

extensions/vscode-api-tests/src/typings/ref.d.ts

@@ -5,6 +5,4 @@
 
 /// <reference path="../../../../src/vs/vscode.d.ts" />
 /// <reference path="../../../../src/vs/vscode.proposed.d.ts" />
-/// <reference path="../../../types/lib.textEncoder.d.ts" />
-/// <reference path="../../../types/lib.url.d.ts" />
 /// <reference types='@types/node'/>