backend/s3: Support overriding EC2 Metadata endpoint

[gdavison]

Terraform Version

N/A

Use Cases

Allow users to override the EC2 Metadata endpoint when authenticating the S3 backend.

Attempted Solutions

N/A

Proposal

Add the parameters ec2_metadata_service_endpoint and ec2_metadata_service_endpoint_mode

References

No response

[gdavison]

Duplicate of #30444

[github-actions]

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