[Tests] Diverse Whisper fixes (#33665)
* fix beam indices in token_timestamps
* fix attention_mask in FA2
* correct translation example with the right example
* correct how somes tests are using outputs + correct num_frames
* fix shortform batch prev cond tests
* make fix-copies
* make fix-copies
* take care of shifting beam indices
* [run-slow] whisper
* [run-slow] whisper
