Rudder

This leads to a big moment of WTH because it does not look like anything is happening, and errors are not diplayed in that screen, but as soon as you navigate to an other screen, you have tens of error "rollback can not start because one is already running".

When the rollback button is clicked, we should AT MINIMA have a notification "rollback started" and a js action that disables all rollback button of the page.
It won't prevent a milicious user to trigger several rollback by reloading the page (this is handled by #18500), but it will help a normal user to understand what is happening.