Disable some tests that need libsox

[mthrok]

In preparation for #3082

Disable those FFmpeg tests that depend on sox CLI. These tests need to be updated or removed so as not to use sox CLI.

Auto-skip some sox tests if decoder/encoder are not available

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/3494

• 📄 Preview Python docs built from this PR

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❌ 6 New Failures

As of commit aeac9e9:

NEW FAILURES - The following jobs have failed:

• build (3.10, 11.8) / Build doc (gh)
• build (3.8) (gh)
• tests (3.10, 11.8) / linux-job (gh)
• tests (3.8, 11.8) / linux-job (gh)
• tests (3.9, 11.8) / linux-job (gh)
• unittests-windows-cpu / windows-job (gh)

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[facebook-github-bot]

@mthrok merged this pull request in 49e9ed9.

[github-actions]

Hey @mthrok.
You merged this PR, but labels were not properly added. Please add a primary and secondary label (See https://github.com/pytorch/audio/blob/main/.github/process_commit.py).

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