Test Support Bundle Should Include Kubelet Log When On K3s Cluster

https://github.com/longhorn/longhorn/issues/7121

Test

Given Longhorn installed on K3s cluster
When generated support-bundle
Then should have worker node kubelet logs in k3s-agent-service.log
And should have control-plan node kubelet log in k3s-service.log (if Longhorn is deployed on control-plan node)

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