Ensure we don't report output status in tests where it's irrelevant (#11257)

In some tests, we use a nonexistent ES host to avoid needing to use a
remote. Output health reporting actually works for beats receivers, so
this can lead to flakiness due to components reporting a degraded state.
Disable the status reporting where it's irrelevant to the test.

Author: swiatekm

testing/integration/ess/monitoring_probe_preserve_text_cfg_test.go

@@ -33,6 +33,8 @@ outputs:
     api_key: "example-key"
     preset: balanced
     allow_older_versions: true
+    status_reporting:
+      enabled: false
 
 inputs:
   - type: system/metrics

testing/integration/ess/upgrade_rollback_test.go

@@ -97,6 +97,8 @@ outputs:
   default:
     type: elasticsearch
     hosts: [127.0.0.1:9200]
+    status_reporting:
+      enabled: false
 
 inputs:
   - condition: '${agent.version.version} == "%s"'