Helm chart does not support Adding an Inaccessible Cluster

[intonet]

Describe the bug

Providing configuration for inaccessible cluster ( without secret ) for kiali-server helm values causing deployment to mount secrets to pod that not exist and pod Crashloop.
My values.yaml:

clustering:
  clusters:
    - name: west
      accessible: false
  kiali_urls:
    - cluster_name: west
      instance_name: kiali
      namespace: istio-system
      url: https://kiali.monitoring.west.internal.xxx.com

When clustering.clusters leave unset, then cluster does not show up in kiali.

Expected Behavior

When, clustering.clusters.accessible=false or if not provided clustering.clusters.secret_name then secrets should not be mounted.

What are the steps to reproduce this bug?

1. Set values for clustering without secret
2. Install via helm kiali-server

Environment

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• Kiali version: v1.81.0
• Istio version: Istio 1.20.2
• Kubernetes impl: RKE2
• Kubernetes version: v1.26.9+rke2r1
• Other notable environmental factors: kiali chart 1.81.0