Fixes #11379 - Audit search for hostgroup/OS title
Before this commit, hostgroup and OS could only be searched by name, which is impractical as names are not unique. As we do on Hosts search, I've added hostgroup_title and os_title as keys to search on /audits.
Related issues
Feature #11379: Audit search does not work with hostgroup/os titles
Fixes #11379 - Audit search for hostgroup/OS title
Before this commit, hostgroup and OS could only be searched by name,
which is impractical as names are not unique. As we do on Hosts search,
I've added hostgroup_title and os_title as keys to search on /audits.