Update to dashboard job totals

As part of a slow rollout, some customers will now see that the Dashboard counts jobs only once, by the last repeated job (e.g. a single job that has been repeated three times and failed each time will display as one failed job in the Dashboard). This behavior matches the Jobs History table, and should result in clearer analytics about the total successful and failed job counts for a given time period.

Once released widely to all existing workspaces, this will be the default behavior for all net new workspaces.