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Summary:
As discussed in the [Torchaudio Migration Proposal](https://docs.google.com/document/d/1PF8biwiGzsjzfEBM78mlLiRrkcsGsvuYkeqkI66Ym8A/edit), this PR moves the Linux CPU unittest job to Nova tooling. Note that this does not disable the existing CircleCI job at the moment.

Passing Job: https://github.com/pytorch/audio/actions/runs/4986115298/jobs/8926499354?pr=3323

Pull Request resolved: https://github.com/pytorch/audio/pull/3323

Reviewed By: atalman, mthrok

Differential Revision: D46113506

Pulled By: osalpekar

fbshipit-source-id: 1778c360e17b9d02c63bcc60100834c75798d380