[EKS] [Search/List Clusters by Tag]: It would be useful to search and list clusters by tag since we generate cluster names by random pet

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**Tell us about your request**
We currently use random_pet generation for out cluster names so we don't always know what our cluster names are going to be. It would be helpful if we could get the datasources for `aws_eks_cluster` and `aws_eks_cluster_auth` via tags.

**Which service(s) is this request for?**
EKS

**Are you currently working around this issue?**
Currently we pull in the arn of the cluster using `aws_resourcegroupstaggingapi_resources` and tags. Then extract the cluster name from the arn.

No repository file or test is named. Start by reviewing the aws_eks_cluster and aws_eks_cluster_auth data sources and the aws_resourcegroupstaggingapi_resources workaround described in the issue; determine how tag-based lookup should expose cluster names and authentication data, then define acceptance tests for the requested behavior.

Written by the indexing model from the issue text.