HPCC-9868 - Create Event Scheduler Workunits Widget

Allow the ability for users to view scheduled workunits and the ability
to deschedule them.

Signed-off-by: Miguel Vazquez
<miguel.vazquez@lexisnexis.com>
Merge pull request #5310 from miguelvazq/Event

HPCC-9868 - Create Event Scheduler Workunits Widget

Reviewed-By: Gordon Smith <gordon.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>