eks: add ephemeral `aws_eks_cluster_auth` resource #39071

Job	Run time
markdown-link-check-a-h-markdown	17s
markdown-link-check-i-z-markdown	19s
markdown-link-check-md	16s
markdown-lint	29s
misspell	33s
terrafmt	38s
tflint	26m 58s
	29m 30s

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