Remove IO function from batch_consistency_test

[jachymuv]

Replace IO function torchaudio.load() usage in test by on-the-fly generated white noise

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[mthrok]

Hi @jachymuv

Thanks for the contribution. It overall looks good.
Could you change sample_rate=8000 and duration=1?
For this test, we do not need such a long audio data.

[jachymuv]

OK, changed to duration=1 and sampling_rate=8000. The last test for spectral centroid I left intact for this PR, so there is still sr=44100 as it was before.

[mthrok]

The change looks good. Thanks!

But the Windows CI is having infrastructure issue, let me come back and rerun tests before merging this.