[Whisper + beam search] fix usage of `beam_indices` (#38259)
* tmp
* fix test_tiny_token_timestamp_batch_generation
* better comments
* test
* comments
* Apply suggestions from code review
Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>
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Co-authored-by: Anton Vlasjuk <73884904+vasqu@users.noreply.github.com>