Add woocommerce_attributes_saved trigger. Closes #35004. (#36943)

plugins/woocommerce/changelog/issues-35004-attributes-saved-trigger

@@ -0,0 +1,4 @@
+Significance: patch
+Type: tweak
+
+Trigger event `woocommerce_attributes_saved` following successful product meta box ajax update.

plugins/woocommerce/client/legacy/js/admin/meta-boxes-product.js

@@ -797,6 +797,9 @@ jQuery( function ( $ ) {
 						$( '#variable_product_options' ).trigger( 'reload' );
 					}
 				);
+
+				$( document.body ).trigger( 'woocommerce_attributes_saved' );
+
 			}
 		} );
 	} );