[MM-55294] Migrate jest v26 to v29 to speed up "web app CI PR / test" (#25192)

webapp/platform/components/setup_jest.ts

@@ -0,0 +1,4 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import '@testing-library/jest-dom';