Split current tests for `update_blog_status()`

The current tests for `update_blog_status()` mirrored the tests for `update_blog_details()` in many ways and can be split in the same way. A noticeable difference is that the the matching actions fire even when no change is made to a field.

See #30080


git-svn-id: https://develop.svn.wordpress.org/trunk@30785 602fd350-edb4-49c9-b593-d223f7449a82