provider: Deprecate support for S3 global endpoint

[ewbankkit]

For Terraform AWS Provider v6.0.0 deprecate support for the S3 global API endpoint.
Relates #33028.

[github-actions]

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[jar-b]

Closed via #42375. These changes will be available in the v6.0.0 beta release later this month.

[github-actions]

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