OpenSearch Domain: Deprecate kibana_endpoint attribute

[ewbankkit]

OpenSearch Domains do not use Kibana for dashboards.
Deprecate the kibana_endpoint in the aws_opensearch_domain resource and data source.

Relates #29867.

[github-actions]

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[github-actions]

This functionality has been released in v5.0.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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