Forwarding logs to AWS CloudWatch fails with "ClusterLogForwarder input validation error"

Issue

• Configured OpenShift Logging to forward logs to AWS CloudWatch, but no collector Pod started and the following errors are seen in ClusterLogging and ClusterLogForwarder.

oc get ClusterLogging instance -o yaml
[...]
status:
  collection:
    logs:
      fluentdStatus: {}
  conditions:
  - lastTransitionTime: "2022-11-10T08:15:59Z"
    message: ClusterLogForwarder input validation error
    reason: ClusterLogForwarder input validation error
    status: "True"
    type: CollectorDeadEnd
  - lastTransitionTime: "2022-11-10T08:52:03Z"
    message: curator is deprecated in favor of defining retention policy
    reason: ResourceDeprecated
    status: "True"
    type: CuratorRemoved
  curation: {}
  logStore: {}
  visualization: {}

oc get ClusterLogForwarder instance -o yaml
[...]
status:
  conditions:
  - lastTransitionTime: "2022-11-10T08:53:29Z"
    message: 'all pipelines invalid: [test-logs]'
    reason: Invalid
    status: "False"
    type: Ready
  outputs:
    cw-output:
    - lastTransitionTime: "2022-11-10T08:53:29Z"
      status: "True"
      type: Ready
  pipelines:
    test-logs:
    - lastTransitionTime: "2022-11-07T08:53:29Z"
      message: 'invalid: unrecognized outputs: [cw], no valid outputs'
      reason: Invalid
      status: "False"
      type: Ready