Remove copy to old Metabase cache from report processing

[preaction]

With the old view-report.cgi being replaced with a new webapp that uses the new test report format, we no longer need to copy test reports to the old Metabase cache tables.

Just in case something is still reading from those tables, we should remove the code that copies the data (from CPAN::Testers::Backend::ProcessReports) and monitor for a few weeks/months to see if anything stops / anyone reports an issue.