REST API: Support assigning terms when creating attachments.

Props mukesh27, Dharm1025, Ankit K Gupta, swissspidy, dharm1025, tanjimtc71, timothyblynjacobs, spacedmonkey.
Fixes #57897.
Built from https://develop.svn.wordpress.org/trunk@57380


git-svn-id: http://core.svn.wordpress.org/trunk@56886 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

@@ -186,6 +186,12 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 			return $fields_update;
 		}
 
+		$terms_update = $this->handle_terms( $attachment_id, $request );
+
+		if ( is_wp_error( $terms_update ) ) {
+			return $terms_update;
+		}
+
 		$request->set_param( 'context', 'edit' );
 
 		/**

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57379';
+$wp_version = '6.5-alpha-57380';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.