In QUnit 2, QUnit.setup()/QUnit.teardown() were renamed, to be called
QUnit.beforeEach()/QUnit.afterEach(). Though we are insulated by this
through MediaWiki's wrapper for backwards compatibility, changing the
names of the functions we pass to the new names allows us to drop the
old ones.
Bug: T170872
Change-Id: I5bfca33c1d4d920d54c2c54b483be78c61b6d0d7