John Blackbourn b9b4776800 Options, Meta APIs: Send a notification to the old admin email address when the site admin email or network admin email address is changed.
This reduces the chances of a site compromise going unnoticed, in the same way that the same notifications for user account email address changes reduces the chances of a user account compromise going unnoticed.

Props MatheusGimenez, johnbillion

Fixes #39117

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git-svn-id: http://core.svn.wordpress.org/trunk@41004 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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