Reduce some of the clutter in `tests/multisite/site.php` and introduce `tests/multisite/updateBlogStatus.php`. Tests moved over are verbatim at this point.
Follow-up to [1078/tests], [29916], [30784], [30785], [33253].
See #56793.
git-svn-id: https://develop.svn.wordpress.org/trunk@54757 602fd350-edb4-49c9-b593-d223f7449a82