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/src/logging.ts

@@ -0,0 +1,47 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { ILogger, LogLevel } from 'vscode-markdown-languageservice';
+
+export class LogFunctionLogger implements ILogger {
+
+	private static now(): string {
+		const now = new Date();
+		return String(now.getUTCHours()).padStart(2, '0')
+			+ ':' + String(now.getMinutes()).padStart(2, '0')
+			+ ':' + String(now.getUTCSeconds()).padStart(2, '0') + '.' + String(now.getMilliseconds()).padStart(3, '0');
+	}
+
+	private static data2String(data: any): string {
+		if (data instanceof Error) {
+			if (typeof data.stack === 'string') {
+				return data.stack;
+			}
+			return data.message;
+		}
+		if (typeof data === 'string') {
+			return data;
+		}
+		return JSON.stringify(data, undefined, 2);
+	}
+
+	constructor(
+		private readonly _logFn: typeof console.log
+	) { }
+
+
+	public log(level: LogLevel, title: string, message: string, data?: any): void {
+		this.appendLine(`[${level} ${LogFunctionLogger.now()}] ${title}: ${message}`);
+		if (data) {
+			this.appendLine(LogFunctionLogger.data2String(data));
+		}
+	}
+
+	private appendLine(value: string): void {
+		this._logFn(value);
+	}
+}
+
+export const consoleLogger = new LogFunctionLogger(console.log);