[MM-46305] Add reporting code for E2E tests (#2222)

* E2E reporting

* Test report

* Fix artifacts.js

* Revert "Test report"

This reverts commit f4d44b881a19c0e9d63066807f5cb6b9fe9017ee.

* PR feedback

e2e/utils/constants.js

@@ -0,0 +1,8 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+const MOCHAWESOME_REPORT_DIR = './mochawesome-report';
+
+module.exports = {
+    MOCHAWESOME_REPORT_DIR,
+};