[Emails & Messages app] Missing trackingNumber in order Order fulfillment updated

[piotrgrundas]

When adding tracking to an order I would like to send an appropriate email with the tracking id/URL included in the email.

Unfortunately from what I am seeing it is not included in the payload.
https://github.com/saleor/apps/blob/main/apps/emails-and-messages/graphql/fragments/OrderDetails.graphql#L1
https://github.com/saleor/apps/blob/main/apps/emails-and-messages/src/pages/api/webhooks/order-fulfilled.ts#L16

I believe it would be sufficient to include order.fulfillments.trackingNumber in to the OrderDtails fragment.