LYNX-687: Action parameter added for return and cancel confirmation links

Author: deepak-soni1

app/code/Magento/OrderCancellationGraphQl/Model/CancelOrderGuest.php

@@ -80,7 +80,8 @@ private function sendConfirmationKeyEmail(Order $order, string $reason): void
                     $order->getIncrementId(),
                     $order->getBillingAddress()->getEmail(),
                     $order->getBillingAddress()->getLastname()
-                )
+                ),
+                'action' => 'cancel'
             ]
         );