resource/aws_cloudfront_distribution: Migrate flatmap package internally for now, add test covering existing active_trusted_signers behavior #10244
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Community Note
Reference: #8902
Reference: #10013
Reference: #10093
Release note for CHANGELOG:
Temporarily keep the existing behavior for the only provider attribute using the legacy package so we can migrate to the standalone Terraform Plugin SDK from the github.com/hashicorp/terraform dependency in the future. Switching this attribute to not use the flatmap package will require state migration or deprecation.
Output from acceptance testing: