Merges [38218] in to 4.6 branch.
Custom JS events are triggered on the document in order for plugins to have something to hook into. The standard began in #31819 is dash separated and begins with wp to signify the namespace, followed by the subject of our action ( "theme", "plugin", etc.) followed by the action and an optional indicator of status ( "install-success", "deleting" ).
This brings some of the theme hooks in line with the standard. As of now, all plugin actions in src/wp-admin/js/updates.js have an equal corresponding theme action.
Fixes#37598.
See #37512, #37216, #31819.
Props olarmarius, ocean90.
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