[Whisper] Fix integration test failures on A10G (dtype, stale values, API changes) (#47995)

* [Whisper] Fix float32/float16 dtype mismatch in integration tests

whisper-large-v3 and distil-large-v3 are now saved as float16 on the Hub.
Tests loaded the model without explicit dtype (loaded as float16) but cast
input_features only to device (stayed float32), causing:
  RuntimeError: Input type (float) and bias type (c10::Half) should be the same

Fix: use input_features.to(torch_device, dtype=model.dtype) in 5 tests:
- test_large_generation
- test_large_generation_multilingual
- test_large_batched_generation
- test_distil_token_timestamp_generation
- test_large_timestamp_generation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [Whisper] Update test_large_timestamp_generation expected transcript

batch_decode(output_offsets=True) now returns a plain dict instead of a list,
and offsets is empty when return_timestamps was not set at generation time.
Update EXPECTED_TRANSCRIPT to match current output.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [Whisper] Update test_whisper_shortform_single_batch_prev_cond expected output

CUDA A10G now produces comma-separated transcription ("leather seating, so soft",
"folks, I lurched") vs previous ("seating so soft", "folks. I lurched").
Update cuda_expectation and cuda_expectation2 to match current output.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [Whisper] Fix remaining integration test failures (value mismatches, API changes, static cache)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [Whisper] Clarify static cache reset comment in test_tiny_static_generation_long_form

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [Whisper] Restore truncated eager vs static comparison in test_tiny_static_generation_long_form

torch.compile introduces tiny fp differences that diverge after ~85-138 generated tokens;
compare only the first 40 generated tokens ([:41]) for basic correctness, and keep the
two-static-run comparison to verify cache-reset correctness.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [Whisper] Add PR reference to static generation test comment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* [Whisper] Remove unnecessary min_len in static cache reorder assertion

Both static runs produce equal-length outputs so min_len is not needed;
use a direct full-sequence comparison instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* format

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Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>