HPCC-10609 Support archived workunits

Added the ability to find, open and restore archived workunits.

Fixes HPCC-10609

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5575 from GordonSmith/HPCC-10609_ArchivedWUs

HPCC-10609 Support archived workunits

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>