What does this PR do?

• Exposes the KSM use_apiserver_cache config option via a DatadogAgent annotation.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

I spun up a local Kubernetes cluster using Colima and Minikube.

Built the operator image locally and loaded it into the cluster.

Updated the CRD to pick up the new useApiServerCache field.

Created the required secrets and applied a DatadogAgent resource with the agent.datadoghq.com/ksm-use-apiserver-cache annotation set to "true":

 apiVersion: datadoghq.com/v2alpha1
  kind: DatadogAgent                                                                
  metadata:
    name: datadog
    annotations:
      agent.datadoghq.com/ksm-use-apiserver-cache: "true"
  spec:                                                                             
    global:
      clusterName: minikube
      credentials:
        apiSecret:
          secretName: datadog-secret
          keyName: api-key
    features:
      kubeStateMetricsCore:
        enabled: true

Verified that the operator generated the KSM Core check ConfigMap with the expected configuration:

kubectl -n system get configmap datadog-kube-state-metrics-core-config -o yaml

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label
• All commits are signed (see: signing commits)