When providing an incorrect path to preload, the `rest_preload_api_request` will silently fail, and nothing will be preloaded.
* Fix typo for `wp_template_part` post type preload path for the Site Editor.
* Do not preload the `wp_block` post type for post editors. The endpoint doesn't support unbound queries, and the data is no longer needed during editor initialization.
Props kirasong, tyxla, mamaduka.
Fixes#61884.
Built from https://develop.svn.wordpress.org/trunk@58904
git-svn-id: http://core.svn.wordpress.org/trunk@58300 1a063a9b-81f0-0310-95a4-ce76da25c4cd