The addition of the `pre_do_shortcode_tag` in [38506] allows plugins to short-circuit the shortcode execution process, which is particularly helpful for caching expensive shortcodes.
The `do_shortcode_tag` is the corresponding part of that system - when a shortcode hasn't been executed previously, there needs to be a clean method of populating the cache.
Props flixos90.
Fixes#32790.
git-svn-id: https://develop.svn.wordpress.org/trunk@38713 602fd350-edb4-49c9-b593-d223f7449a82
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