Clusterlogforwarder shows degraded pipeline when default is defined in outputRefs

Issue

• Clusterlogforwarder shows unrecognized outputs for pipelines in status section:

   pipelines:
     abc-pipeline:
     - lastTransitionTime: "2023-04-03T15:17:23Z"
       message: 'invalid: unrecognized outputs: [default]'
       reason: Invalid
       status: "True"
       type: Degraded
  

• Clusterlogforwarder shows degraded pipelines in status section:

  status:
   conditions:
   - lastTransitionTime: "2023-04-03T15:17:23Z"
     message: 'degraded pipelines: invalid [], degraded [abc-pipeline]'
     reason: Invalid
     status: "True"
     type: Degraded
   - lastTransitionTime: "2023-04-03T15:17:23Z"
     message: Some pipelines are degraded or invalid
     reason: Invalid
     status: "True"
     type: Ready