T5 migration to new masking interface (#41804)
* Refactor: migrate T5 attention masking to masking_utils interface
* Refactor: migrate T5 attention masking to masking_utils interface
* create_bidirectional_mask function with appropriate paramaters
* create_bidirectional_mask function with appropriate paramaters
* fixup executorch + import
* revert causal masks
* rm executorch stuff
* add causal mask with non vmap
* copies
* remove unnecessary import
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Co-authored-by: Vasqu <antonprogamer@gmail.com>
Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>
