Add Age column to Report list pages

[nublarsec]

It would be very useful to see the Age of each report on the list pages, just like kubectl output:

> k get vulnerabilityreport -A
NAMESPACE   NAME                                                              REPOSITORY                                       TAG       SCANNER   AGE
default     pod-insecure-nginx-nginx                                          library/nginx                                    1.16      Trivy     7d11h
telemetry   daemonset-mon-prometheus-node-exporter-node-exporter              prometheus/node-exporter                         v1.3.1    Trivy     28d
telemetry   replicaset-mon-grafana-5d574b47b7-grafana                         grafana/grafana                                  8.3.4     Trivy     28d

This should be added to the 3 current report pages:

• Vulnerability Reports
• Config Audit Reports
• CIS Kube Bench Reports