### Description

Currently some code in RDS Operators use boto waiters and some uses a custom `_await_status`, the former is preferred over the later (waiters are vetted code provided by the boto sdk, they have features like exponential backoff, etc). See [this discussion thread](https://github.com/apache/airflow/pull/27076#discussion_r997325535) for more details/context.

### Use case/motivation

_No response_

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

del cls.dag
        del cls.hook
    @mock_rds
    def test_start_export_task(self):
        _create_db_instance(self.hook)
        _create_db_instance_snapshot(self.hook)
        start_export_operator = RdsStartExportTaskOperator(
            task_id="test_start",
            export_task_identifier=EXPORT_TASK_NAME,
            source_arn=EXPORT_TASK_SOURCE,
            iam_role_arn=EXPORT_TASK_ROLE_ARN,
            kms_key_id=EXPORT_TASK_KMS,
            s3_bucket_name=EXPORT_TASK_BUCKET,
            aws_conn_id=AWS_CONN,
            dag=self.dag,
        )
        _patch_hook_get_connection(start_export_operator.hook)
        start_export_operator.execute(None)
        result = self.hook.conn.describe_export_tasks(ExportTaskIdentifier=EXPORT_TASK_NAME)
        export_tasks = result.get("ExportTasks")
        assert export_tasks
        assert len(export_tasks) == 1
        assert export_tasks[0]["Status"] == "complete"
    @mock_rds
    @patch.object(RdsBaseOperator, "_await_status")
    def test_start_export_task_no_wait(self, mock_await_status):