HPCC-10724 Implement disk space usage for a scope/owner

Fixes HPCC-10724

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5487 from GordonSmith/HPCC-10724

HPCC-10724 Implement disk space usage for a scope/owner

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>