REST API: Add inserter field to the schema of Patterns endpoint

Backports changes from WordPress/gutenberg#40416. Adds the missing `inserter` field to the Patterns item schema. This field was omitted from the response, and patterns that should be hidden in the inserter were visible.

Props mamaduka, ndiego.
See #55567.
Follow-up [53152].




git-svn-id: https://develop.svn.wordpress.org/trunk@53210 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/rest-api/endpoints/class-wp-rest-block-patterns-controller.php

@@ -127,6 +127,7 @@ public function prepare_item_for_response( $item, $request ) {
 			'categories'    => 'categories',
 			'keywords'      => 'keywords',
 			'content'       => 'content',
+			'inserter'      => 'inserter',
 		);
 		$data   = array();
 		foreach ( $keys as $item_key => $rest_key ) {
@@ -202,6 +203,12 @@ public function get_item_schema() {
 					'readonly'    => true,
 					'context'     => array( 'view', 'edit', 'embed' ),
 				),
+				'inserter'       => array(
+					'description' => __( 'Determines whether the pattern is visible in inserter.' ),
+					'type'        => 'boolean',
+					'readonly'    => true,
+					'context'     => array( 'view', 'edit', 'embed' ),
+				),
 			),
 		);