[MM-21835] Use URL instead of the url library (#1384)

Additionally, migrate all of the URL related helper functions
from `src/utils/utils.js` to the new `src/utils/url.js` file
and migrate tests.

Issue MM-21835
Fixes #1206

test/modules/utils.js

@@ -1,4 +1,3 @@
-
 // Copyright (c) 2015-2016 Yuya Ochiai
 // Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.