Split current tests for `update_blog_details()`

The current tests for `upload_blog_details()` were focused on the actions fired whenever a site is marked as spam, archived, deleted, or matured. This breaks those into individual sections with fewer assertions per test.

See #30080


git-svn-id: https://develop.svn.wordpress.org/trunk@30784 602fd350-edb4-49c9-b593-d223f7449a82