(opensearch): Some configuration options are not available for use

### Describe the feature

This is duplicated from https://github.com/aws/aws-cdk/issues/16575 which should not have been closed. This is blocked on [Cloudformation support](https://github.com/aws-cloudformation/cloudformation-coverage-roadmap/issues/832), but should be added once this support is available.

It is not possible to disable Auto-Tune when creating a new OpenSearch domain.

### Use Case

To allow use of domains without Auto-Tune. To allow for use of cheap instances that don't support Auto-Tune without custom resources or other hacks.

### Proposed Solution

Once Cloudformation supports Auto-Tune, expose the parameter in the CDK construct.

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CDK version used

2.110.1

### Environment details (OS name and version, etc.)

Ubuntu (Windows Subsystem for Linux)

First verify whether CloudFormation support has landed for the Auto-Tune setting in coverage-roadmap issue 832. Then locate the AWS CDK OpenSearch domain construct and its tests; done means exposing the setting once the underlying CloudFormation property is available. No file or test path is named in the issue.

Written by the indexing model from the issue text.