Deploy webhook notifications are premature, inaccurate and misleading

[ProNotion]

Issue description

The deploy webhook notification fires long before the deployment actually completes and they do not seem to report the true outcome of the deployment.

I have observed on numerous occasions that the webhook will fire off a notification to say it was successful when in fact the Umbraco Cloud UI indicates the deployment is still ongoing for many minutes after the notification was sent. What this means is that a success notification can be sent out when in fact the deployment eventually fails fails. This makes them unreliable and as they are not reporting the true outcome of the deployment.

Here is the Umbraco Cloud UI nearly 5 minutes after the notification was sent....

This issue is consistent and repeatable.

[ProNotion]

I should also note that the Umbraco Cloud UI is equally unreliable and will sometimes say a deployment completed successfully when in fact it will later indicate that it did not and there was an error.

[ProNotion]

Here is an example of where we got a success notification from the webhook and the UI later shows this: