Fix tests in ASR pipeline

[ylacombe]

What does this PR do?

#33509 highlighted that some slow ASR tests were never passing, due to how data was loaded. This PR mainly fixes this + fixes some slow Whisper tests that are easy to fix.

There's still 3 slow failing tests in the ASR pipeline related to Whisper, but they'll have to wait for other Whisper fixes.

Remaining failing tests

FAILED tests/pipelines/test_pipelines_automatic_speech_recognition.py::AutomaticSpeechRecognitionPipelineTests::test_simple_whisper_asr - AssertionError: {'tex[827 chars]4.56, 4.92)}, {'text': ' gospel.', 'timestamp': (4.92, 5.82)}]} != {'tex[827 chars]4.56, 4.92)}, {'text': ' gospel.', 'timestamp': (4.92, 5.84)}]}
FAILED tests/pipelines/test_pipelines_automatic_speech_recognition.py::AutomaticSpeechRecognitionPipelineTests::test_simple_whisper_translation - AssertionError: {'text': ' A man said to the universe, Sir, I exist.'} != {'text': ' Mr. Quilter is the apostle of the middle [43 chars]el.'}
FAILED tests/pipelines/test_pipelines_automatic_speech_recognition.py::AutomaticSpeechRecognitionPipelineTests::test_whisper_word_timestamps_batched - AssertionError: {'tex[81 chars] his to welcome his gospel.', 'chunks': [{'tex[898 chars]2)}]} != {'tex[81 chars] his gospel.', 'chunks': [{'text': ' Mr.', 'ti[747 chars]2)}]}

[HuggingFaceDocBuilderDev]

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[LysandreJik]

Thanks for fixing the tests!