Add ca_cert_identifier field to aws_rds_cluster_instance

[rune-chan]

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Relates OR Closes #11142

Release note for CHANGELOG:

resource/aws_rds_cluster_instance: Add `ca_cert_identifier` argument

Output from acceptance testing:

$  make testacc TEST=./aws TESTARGS='-run=TestAccAWSRDSClusterInstance_CACertificateIdentifier'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSRDSClusterInstance_CACertificateIdentifier -timeout 120m
=== RUN   TestAccAWSRDSClusterInstance_CACertificateIdentifier
=== PAUSE TestAccAWSRDSClusterInstance_CACertificateIdentifier
=== CONT  TestAccAWSRDSClusterInstance_CACertificateIdentifier
--- PASS: TestAccAWSRDSClusterInstance_CACertificateIdentifier (1810.16s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       1810.198s

[awsiv]

Duplicate : #10954

Not sure why no one has looked into this yet :(

[rune-chan]

@awsiv I will close mine if it's duplicated.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!