[FEAT]: Implement notifications' mark_thread_as_done method

### Describe the need

The mark_thread_as_done method is missing from the Octokit client.

[Documentation](https://docs.github.com/en/rest/activity/notifications?apiVersion=2022-11-28#mark-a-thread-as-done)

### SDK Version

_No response_

### API Version

_No response_

### Relevant log output

```shell

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### Code of Conduct

- [x] I agree to follow this project's Code of Conduct