add task timestamps to "latest warning/error task" dashboard widget
Description of problem:
The "latest warning/error tasks" widget does not show the timestamps of when the warning/error task occurred. This makes the widget's info less useful since you don't know if it's showing an issue you need to address or just old info.
Version-Release number of selected component (if applicable): 6.2.10
Refs #20230 - Show task start time on dashboard widget
Indstead of end time, since paused tasks don't have an end time.