Felix Arntz 363445adcb Multisite: Revert [41719].
While `get_site_by()` makes sense as a more explicit and less complex replacement for `get_blog_details()`, it is not ready yet in terms of caching, where it currently falls short of the older function under specific circumstances.

See #40180, #40228.


git-svn-id: https://develop.svn.wordpress.org/trunk@41883 602fd350-edb4-49c9-b593-d223f7449a82
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