Upgrade/Install: Pass details about the specific plugin and theme updates attempted to filters.

This adds an additional parameter to the `auto_plugin_update_send_email` and `auto_theme_update_send_email` filters to provide the additional context of which updates were attempted and their outcome. This will help plugin and theme auto-update emails to be better tailored to a site owner's liking.

Props audrasjb, Paddy Landau, desrosj.
Merges [48888] to the 5.5 branch.
Fixes #50988.
Built from https://develop.svn.wordpress.org/branches/5.5@48889


git-svn-id: https://core.svn.wordpress.org/branches/5.5@48651 1a063a9b-81f0-0310-95a4-ce76da25c4cd