HPCC-10225 Display graph timings in HH:MM:SS.mm format

Fixes HPCC-10225

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5106 from GordonSmith/HPCC-10225

HPCC-10225 Display graph timings in HH:MM:SS.mm format

Reviewed-By: Kevin Wang <kevin.wang@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>