Editor: Update preloaded paths for the site editor

Add the `OPTIONS /wp/v2/pages` route to the list. The request is made via the `useBlockEditorSettings` hook at the top of the editor React tree. Preloading should improve the editor's loading time.

Avoid hardcoding paths for the 'attachment' post type; use the `rest_get_route_for_post_type_items` helper method instead.

Props mamaduka, noisysocks.
See #61884.
Built from https://develop.svn.wordpress.org/trunk@58984


git-svn-id: https://core.svn.wordpress.org/trunk@58380 1a063a9b-81f0-0310-95a4-ce76da25c4cd

Author: Mamaduka

wp-admin/site-editor.php

@@ -88,7 +88,8 @@ static function ( $classes ) {
 );
 
 $preload_paths = array(
-	array( '/wp/v2/media', 'OPTIONS' ),
+	array( rest_get_route_for_post_type_items( 'attachment' ), 'OPTIONS' ),
+	array( rest_get_route_for_post_type_items( 'page' ), 'OPTIONS' ),
 	'/wp/v2/types?context=view',
 	'/wp/v2/types/wp_template?context=edit',
 	'/wp/v2/types/wp_template_part?context=edit',

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58983';
+$wp_version = '6.7-alpha-58984';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.