Actually run all the tests

Some of the ones that were moved to ve-mw disappeared from index.php
(the MW-only test runner) and/or VisualEditor.hooks.php (the runner for
Special:JavaScriptTest that's also used by Jenkins).

Add the missing tests, and rename the SurfaceFragment test. We can't
add the ViewPageTarget test to the index.php file in ve-mw because
it only works when running inside an actual MediaWiki instance.

Change-Id: Iec34f2029f5f9c34855b4d79ef70db5751461a96