chore(rds): add clusterArn property to DatabaseCluster

[BenFradet]

Issue # (if applicable)

Reason for this change

This is to bring parity with #10741, we need the cluster arn to enable data api manually waiting for #28574.

Description of changes

This adds a clusterArn property to IDatabaseCluster

Description of how you validated changes

The changes have been validated through a unit test

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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[colifran]

Nit: looks like the spelling got a little messed up here -- how about just "The ARN of the database cluster"?

[BenFradet]

sorry, don't know how that got there 😅

[colifran]

Looks good! Just one small comment.

Pull request has been modified.

[affanc]

Hello Team,
Another construct that should be supporting the Serverless v2 is:
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_appsync.RdsDataSource.html

[affanc]

@colifran any update on this issue. can cx try anything from their end to resolve this issue

[colifran]

@affanc It seems like you're saying this same functionality should be replicated on the construct you linked? If that's the case, they should open an issue or they can create a PR to add the functionality they need.

[aws-cdk-automation]

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