Disable some tests that need libsox

In preparation for pytorch#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

.github/workflows/unittest-linux-cpu.yml

@@ -49,6 +49,9 @@ jobs:
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_ON_PYTHON_310=true
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_AUDIO_OUT_DEVICE=true
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_MACOS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_TEMPORARY_DISABLED=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_SOX_DECODER=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_SOX_ENCODER=true
         echo '::endgroup::'
 
         set -euxo pipefail

.github/workflows/unittest-macos-cpu.yml

@@ -48,6 +48,9 @@ jobs:
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_ON_PYTHON_310=true
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_MOD_sentencepiece=true
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_AUDIO_OUT_DEVICE=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_TEMPORARY_DISABLED=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_SOX_DECODER=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_SOX_ENCODER=true
         echo '::endgroup::'
 
         set -euxo pipefail

.github/workflows/unittest-windows-cpu.yml

@@ -45,6 +45,7 @@ jobs:
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_MOD_sentencepiece=true
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_AUDIO_OUT_DEVICE=true
         export TORCHAUDIO_TEST_ALLOW_SKIP_IF_NO_MACOS=true
+        export TORCHAUDIO_TEST_ALLOW_SKIP_IF_TEMPORARY_DISABLED=true
 
         .github/scripts/unittest-windows/setup_env.sh
         .github/scripts/unittest-windows/install.sh