fix(helm): remove hardcoded kmcp tag image

[jmhbh]

Remove the hardcoded kmcp.image.tag value from the default helm values. The issue in kmcp has been resolved and we now use the kmcp image tag set by KMCP_VERSION.

Tested locally by running helm install with the updated values.yaml.

❯ k get deploy -n kagent kagent-kmcp-controller-manager -oyaml | grep image
        image: ghcr.io/kagent-dev/kmcp/controller:0.2.6
        imagePullPolicy: IfNotPresent

[Copilot]

Pull request overview

This PR removes the hardcoded kmcp image tag from the helm chart values, allowing the kmcp dependency to use its default versioning mechanism. The change eliminates a temporary workaround that was needed until a kmcp issue was resolved (referenced as kagent-dev/kmcp#74).

Changes:

• Removed hardcoded kmcp.image.tag: "0.2.2" from helm/kagent/values.yaml
• Removed associated comment about the workaround and chart values reference

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