change find backup procedure for Veeam V12.1 and later (#3214)

Running rear recover on different hardware will not show the backups of the original system due to the way
how Veeam registers the rescue system as a new client (under the same name, but with different ID).

This change handles this situation by searching for all backups for HOSTNAME and selecting the newest one.

Searching for HOSTNAME, which is guaranteed to be a short machine name, also to matches the fqdn in case the system is registered in Veeam under the fqdn instead of the short machine name.