d/aws_redshift_service_account: Deprecate

[ewbankkit]

AWS document that a service principal name be used instead of AWS account ID in any relevant IAM policy.
The aws_redshift_service_account should now be considered deprecated and will be removed in a future version.

[github-actions]

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[jar-b]

Closed by #31006, merged to main via #31392

[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.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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