Add an information in the UI that an upgrade is currently running / an upgrade is available

[Pierre-Gilles]

We want that on first start of Gladys, the user is aware that Gladys may be outdated already (because the Raspbian image is not always up to date), we need to display a message to explain that Gladys will upgrade automatically.

Ref => https://community.gladysassistant.com/t/gladys-v4-rpi-3b-zwave-probleme/4990/25