helm: lower job-status-consumer prefetch value

- set job-status-consumer RabbitMQ prefetch value to 10;
- this should reduce the risk of getting 406 PRECONDITION error on message ack.

addresses reanahub/reana-workflow-controller#436

helm/reana/values.yaml

@@ -85,7 +85,7 @@ components:
     image: reanahub/reana-workflow-controller:0.9.0-alpha.2
     environment:
       SHARED_VOLUME_PATH: /var/reana
-      REANA_JOB_STATUS_CONSUMER_PREFETCH_COUNT: 200
+      REANA_JOB_STATUS_CONSUMER_PREFETCH_COUNT: 10
   reana_workflow_engine_cwl:
     image: reanahub/reana-workflow-engine-cwl:0.9.0-alpha.2
   reana_workflow_engine_yadage:
@@ -141,4 +141,4 @@ quota:
   workflow_termination_update_policy: "{{ .Values.quota.termination_update_policy }}"
   # backward compatibility
   disk_update: "0 3 * * *"  # everyday at 3am
-  termination_update_policy: "disk,cpu"
+  termination_update_policy: ""