[Enhancement]: Add support for promoting read replica to standalone db cluster

[nam054]

Description

Add feature to promote an aws_rds_cluster read replica. (Similar to how aws_db_instance has a feature to promote read replica by setting the replicate_source_db attribute to null)
Will probably need to use this API.

Affected Resource

• aws_rds_cluster

Potential Terraform Configuration

External interface of the resource would not change however a modification to the replication_source_identifier would have an extra check to allow promotion.

References

• Relates to Cannot destroy an Aurora RDS cluster when it was built with a replication_source_identifier value #6749
• Relates to resource/rds_cluster: add support for promoting a read replica to standalone db cluster #16892 (closed PR but attempts implementation)
• https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_PromoteReadReplicaDBCluster.html

[github-actions]

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[github-actions]

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[github-actions]

This functionality has been released in v5.79.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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