Issue # (if applicable)

Closes #31116 .

Reason for this change

It was not possible to call the grantDataApiAccess method for an imported database cluster.

Because the imported database cluster always has the enableDataApi with false.

https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-rds/lib/cluster.ts#L983

class ImportedDatabaseCluster extends DatabaseClusterBase implements IDatabaseCluster {
  // ...
  protected readonly enableDataApi = false;

But the grantDataApiAccess throws an error when the enableDataApi is set to false.

https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-rds/lib/cluster.ts#L523-L526

  public grantDataApiAccess(grantee: iam.IGrantable): iam.Grant {
    if (this.enableDataApi === false) {
      throw new Error('Cannot grant Data API access when the Data API is disabled');
    }
    // ...
}

Description of changes

Added the property dataApiEnabled to attributes for the imported database cluster.

If the dataApiEnabled to the attributes is set to true, the enableDataApi in the imported cluster will be set to true and the grantDataApiAccess can be called.

Description of how you validated changes

Unit and integ tests.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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