Add a few simple browser tests for the admin UI

Ramu Challarequested to merge
issue/revision_manager-3522620:3522620-add-a-few into 1.0.x
  • /tests/src/Functional/RevisionManagerConfigFormTest.php
  • /tests/src/FunctionalJavascript/RevisionManagerBundleConfigureLinkTest.php

Closes #3522620

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