HPCC-12375 Add missing WU actions on Activity PageBreak.css

Added Pause PauseNow and Resume.

Fixes HPCC-12375

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #6605 from GordonSmith/HPCC-12375

HPCC-12375 Add missing WU actions on Activity PageBreak.css

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>