Merge from vscode merge-base (#22780)

* Revert "Revert "Merge from vscode merge-base (#22769)" (#22779)"

This reverts commit 47a1745180.

* Fix notebook download task

* Remove done call from extensions-ci

extensions/markdown-language-features/server/extension-browser.webpack.config.js

@@ -0,0 +1,24 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+//@ts-check
+
+'use strict';
+
+const withBrowserDefaults = require('../../shared.webpack.config').browser;
+const path = require('path');
+
+module.exports = withBrowserDefaults({
+	context: __dirname,
+	entry: {
+		extension: './src/browser/main.ts',
+	},
+	output: {
+		filename: 'main.js',
+		path: path.join(__dirname, 'dist', 'browser'),
+		libraryTarget: 'var',
+		library: 'serverExportVar'
+	}
+});