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Summary:
Conda package build performs simple smoke test, which is different
from smoke_test jobs we define on our CI jobs.

Currently Conda packaging smoke test verifies the imporatability of
`torchaudio.prototype.io`, which requires FFmpeg 4.

1. We list FFmpeg 4 as runtime requirements, but this means that
conda's dependency resolver takes FFmpeg 4 into consideration.
FFmpeg 5 was release this year, and we can expect that user base
will move to FFmpeg gradually. If user environment has some constraint
on FFmpeg, torchaudio will have conflict and it will prevent users
from install torchaudio.

2. In #2377 the way optional dependency is checked/initialized is changed,
so this Conda smoke test will no longer check the integrity with FFmpeg libraries.

To solve the issues above, this commit moves the part that tests integrity with
FFmpeg libraries to the smoke test we define on CircleCI.

Pull Request resolved: https://github.com/pytorch/audio/pull/2381

Reviewed By: carolineechen

Differential Revision: D36323706

Pulled By: mthrok

fbshipit-source-id: 57ca816e0f3ad8e16d21e56062f6ed8a09ab93a3