Block Editor: Declare the wp_template post type as built-in.

Remove redundant `show_in_admin_bar` property, which defaults to the value of `show_in_menu`.

Follow-up to [51003].

See #53176.
Built from https://develop.svn.wordpress.org/trunk@51014


git-svn-id: http://core.svn.wordpress.org/trunk@50623 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -336,10 +336,10 @@ function create_initial_post_types() {
 			),
 			'description'           => __( 'Templates to include in your theme.' ),
 			'public'                => false,
+			'_builtin'              => true, /* internal use only. don't use this when registering your own post type. */
 			'has_archive'           => false,
 			'show_ui'               => false,
 			'show_in_menu'          => false,
-			'show_in_admin_bar'     => false,
 			'show_in_rest'          => true,
 			'rewrite'               => false,
 			'rest_base'             => 'templates',

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-51013';
+$wp_version = '5.8-alpha-51014';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.