Move usage ping JSON payload to a new page

Description

In the administration panel, we display the JSON payload of the usage ping in one, hard to read line.

We should display it in a separate page and improve its readibility.

Proposal

• Remove the JSON we send from the screen
• Add a link to open a new page that will display the payload
• Actually display the JSON payload in a readable format in the new page (please ignore the "-" in the wireframe below)

Wireframes