[v15] Reduce resource consumption when generating Kubernetes certificates #52148
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…52109) Closes #52073. The requested Kubernetes cluster is now cross referenced with the KubeServers in the unified resource cache. This results in a reduction in CPU, memory, and cert generation latency. This also cleans up some of the helper functions in lib/kube/utils that were no longer needed, and suboptimal. The client side changes here shouldn't have any impact, as the server is performing the same check, and returning the equivalent error the client side code used to. This will also cut the time of `tctl auth sign` in half as both the client and server were performing the same expensive CheckKubeCluster operation.
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Backport #52109 to branch/v15
Changelog: Improve latency and reduce resource consumption of generating Kubernetes certificates via tctl auth sign and tsh kube login.