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`get_site_by()` is now the preferred way to retrieve a site object by lookup for identifying data. By using a coherent structure and `get_sites()` internally, it has several advantages over the direct database queries and complex code in `get_blog_details()`. Therefore `get_blog_details()` is now a wrapper for `get_site_by()`, providing backward compatibility fixes where necessary. Unit tests have been adjusted to account for the `blog-details` and `blog-lookup` cache groups, which are no longer needed. Props spacedmonkey, jeremyfelt, flixos90. Fixes #40228. git-svn-id: https://develop.svn.wordpress.org/trunk@41719 602fd350-edb4-49c9-b593-d223f7449a82