QUA: Hide 'Message' field in plan details when execution hasn't failed

In the history list, a plan's details information always contains the `Message` field:

This field, however, is never returned by the API when the plan execution succeeded. That means that in all such cases, the field is empty, and the information button next to it doesn't work. This can generate some confusion for users, so it should be hidden when it makes no sense to display it.

Start by locating the history list's plan details view and the code that renders the Message field and its information button. Compare the UI with the API response for successful and failed executions; done means Message is hidden, along with its button, when execution has not failed, while failed executions still show it.

Written by the indexing model from the issue text.