RDS is destroyed on next terraform apply if snapshot_identifier is changed

[robinbowes]

If we restore an RDS instance from a snapshot then change the snapshot identifier, the RDS instance is deleted and re-created.

Some discussion of the issue here: https://discuss.hashicorp.com/t/rds-restored-from-snapshot-is-destroyed-on-next-terraform-apply/3693

[bryantbiggs]

closing this in favor of what is provided by the latest release of the upstream AWS provider hashicorp/terraform-provider-aws#18013

[github-actions]

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