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/platform/client/jest.config.js

@@ -0,0 +1,11 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+/** @type {import('jest').Config} */
+
+module.exports = {
+    moduleNameMapper: {
+        '^@mattermost/types/(.*)$': '<rootDir>/../types/src/$1',
+    },
+    setupFiles: ['isomorphic-fetch'],
+};