Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

webapp/scripts/dev-server.js

@@ -0,0 +1,33 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+/* eslint-disable no-console */
+
+const chalk = require('chalk');
+const concurrently = require('concurrently');
+
+const {getWorkspaceCommands} = require('./utils.js');
+
+async function watchAllWithDevServer() {
+    console.log(chalk.inverse.bold('Watching web app and all subpackages...'));
+
+    const commands = [
+        {command: 'npm:dev-server:webapp', name: 'webapp', prefixColor: 'cyan'},
+        {command: 'npm:start:product --workspace=boards', name: 'boards', prefixColor: 'blue'},
+        {command: 'npm:start:product --workspace=playbooks', name: 'playbooks', prefixColor: 'red'},
+    ];
+
+    commands.push(...getWorkspaceCommands('run'));
+
+    console.log('\n');
+
+    const {result} = concurrently(
+        commands,
+        {
+            killOthers: 'failure',
+        },
+    );
+    await result;
+}
+
+watchAllWithDevServer();