Execute `woocommerce_order_action_{$action}` only once

Prevents a “Maximum function nesting level reached” fatal error in
certain cases.

Since this ends up running on `’save_post’`, updating something like
the order status while hooked onto to
`woocommerce_order_action_{$action}` causes a fun recursion :)

includes/admin/meta-boxes/class-wc-meta-box-order-actions.php

@@ -128,8 +128,9 @@ class WC_Meta_Box_Order_Actions {
 
 			} else {
 
-				do_action( 'woocommerce_order_action_' . sanitize_title( $action ), $order );
-
+				if ( ! did_action( 'woocommerce_order_action_' . sanitize_title( $action ) ) ) {
+					do_action( 'woocommerce_order_action_' . sanitize_title( $action ), $order );
+				}
 			}
 		}
 	}