Fix falcon with SDPA, alibi but no passed mask (#30123)
* fix falcon without attention_mask & alibi
* add test
* Update tests/models/falcon/test_modeling_falcon.py
Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
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Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>
