Log wrote to device at MB/sec for clone Persistent Storage too
While working on #19887 (closed), I thought it would be useful and consistent to also log the MB/sec of the Persistent Storage cloning.
This might help users identify which USB sticks in the store would back up much faster than their current one. As MB/sec write speed is usually prominently advertised.
I have a MR ready to close this issue.
@sajolida can review the UX concept if necessary.