Nomad Jobs only displays Service Jobs

Affected Versions:  2.14.0 to 2.19.4 (Nomad support was removed in 2.20.0)

Issue Description

Nomad Jobs are only displaying Service Jobs.  

Cause

This issue is the result of a bug where System, Batch and Sysbatch Jobs are causing the Portainer UI to break. To avoid this bug we currently only display Service Jobs in the Portainer UI.