Skip `test_export_to_onnx` for `LongT5` if `torch` < 1.11 (#19122)
* Skip if torch < 1.11
* fix quality
* fix import
* fix typo
* fix condition
* fix condition
* fix condition
* fix quality
* fix condition
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>