Add .failure() event listener for error handling. (#11691)
* Add .failure() event listener for error handling.
* remove test.py.
* docs: add documentation for .failure() event listener.
* add changeset
* Update gradio/blocks.py
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
* added e2e test
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
