Editor: Add post types property to wp-rest-block-patterns-controller.php.

Backports PHP changes in WordPress/gutenberg#41791 to the core. Adds the post types property to the rest API patterns endpoint.

Props mcsf, ntsekouras, matveb.
See #56467.

git-svn-id: https://develop.svn.wordpress.org/trunk@54263 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/block-patterns.php

@@ -189,6 +189,7 @@ function _register_remote_theme_patterns() {
  *   - Categories       (comma-separated values)
  *   - Keywords         (comma-separated values)
  *   - Block Types      (comma-separated values)
+ *   - Post Types       (comma-separated values)
  *   - Inserter         (yes/no)
  *
  * @since 6.0.0
@@ -203,6 +204,7 @@ function _register_theme_block_patterns() {
 		'categories'    => 'Categories',
 		'keywords'      => 'Keywords',
 		'blockTypes'    => 'Block Types',
+		'postTypes'     => 'Post Types',
 		'inserter'      => 'Inserter',
 	);
 
@@ -274,7 +276,7 @@ function _register_theme_block_patterns() {
 					}
 
 					// For properties of type array, parse data as comma-separated.
-					foreach ( array( 'categories', 'keywords', 'blockTypes' ) as $property ) {
+					foreach ( array( 'categories', 'keywords', 'blockTypes', 'postTypes' ) as $property ) {
 						if ( ! empty( $pattern_data[ $property ] ) ) {
 							$pattern_data[ $property ] = array_filter(
 								preg_split(