fix(sources): annotation suppression failed when log_namespace is enabled in kubernetes_logs

[iFurySt]

Close #20682

Before:

After:

Config:

schema:
    log_namespace: true

sources:
    source_kubernetes:
      type: kubernetes_logs
      self_node_name: "abc123"
      pod_annotation_fields:
        container_id: ""
        container_image_id: ""
      #   pod_labels: ""
      #   pod_owner: ""

transforms:
  transform_namespace:
    type: remap
    inputs:
      - source_kubernetes
    source: |
      .event_data = .
      .meta_data = %

sinks:
  console:
    type: console
    inputs:
      - transform_namespace
    encoding:
      codec: json