S3: Support AWS_S3_US_EAST_1_REGIONAL_ENDPOINT environment variable with AWS SDK for Go v2

[ewbankkit]

As AWS SDK for Go v2 does not support the AWS_S3_US_EAST_1_REGIONAL_ENDPOINT environment variable, after merging #33304 we have lost support for this method of configuring the required functionality for those S3 resources (eventually all) that use AWS SDK for Go v2.

Relates #10923.
Relates #33028.

[github-actions]

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[github-actions]

This functionality has been released in v5.21.0 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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