feat(monitoring): Enable dashboard imports for Grafana

This patch will enable importing dashboards for Grafana from namespaces
the same way, we import `serviceMonitors` and `podMonitors`, making it
possible to deploy all monitoring resources along the application.

infrastructure/monitoring/release.yaml

@@ -78,6 +78,7 @@ spec:
       sidecar:
         dashboards:
           enabled: true
+          searchNamespace: ALL
         datasources:
           enabled: true
           defaultDatasourceEnabled: true