SERVER-95116 made it so that the override only retries writes if using retryable write. However, not all suites that use the override use retryable writes. If a write has a batch size of 1 and returned a retryable error, it should be safe to retry the write, so we'll unnecessarily fail some writes. We'll also allow retrying inserts with a batch larger than 1, and ignore the errors if all are duplicate key errors.