Non-English character got UNICODE-escaped when getting logs from EKS to Cloudwatch logs

[ensean]

### Describe the question/issue Non-English characters in EKS log got UNICODE-escaped in Cloudwatch logs. * Input logs ``` abc, today is a good day 好雨知时节 ``` * Cloudwatch logs view  This issue may related to https://github.com/fluent/fluent-bit/issues/8521, which can resolved via building fluent-bit on graviton with flag `-DCMAKE_C_FLAGS="-fsigned-char"` ### Configuration

part of EKS daemon set yaml

---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluent-bit
  namespace: amazon-cloudwatch
  labels:
    k8s-app: fluent-bit
    version: v1
    kubernetes.io/cluster-service: "true"
spec:
  selector:
    matchLabels:
      k8s-app: fluent-bit
  template:
    metadata:
      labels:
        k8s-app: fluent-bit
        version: v1
        kubernetes.io/cluster-service: "true"
    spec:
      containers:
      - name: fluent-bit
        image: public.ecr.aws/aws-observability/aws-for-fluent-bit:stable
        imagePullPolicy: Always
...

Fluent Bit Log Output

Fluent Bit Version Info

Cluster Details

Application Details

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