Remove scipy torchcodec hack

[samanklesaria]

Previously, we found that the pytorch CI infrastructure made installing ffmpeg beyond version 4 impossible. And this version was buggy, which was making our tests fail. We hacked around the issue by making scipy pretend it was torchcodec. But the integration tests require reading flac files, which aren't supported by scipy. Fortunately, @pearu's miniconda approach to CI seems like it's been able to install more recent ffmpeg versions. So maybe we can do the same thing with the linux test CI!

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/audio/4093

• 📄 Preview Python docs built from this PR

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❌ 8 New Failures, 2 Unrelated Failures

As of commit 0b430dd with merge base 0639492 ():

NEW FAILURES - The following jobs have failed:

• .github/workflows/integration-test.yml (gh)
• Build Aarch64 Linux Wheels / pytorch/audio / build-wheel-py3_10-cuda-aarch6412_6-aarch64 (gh)
  Process completed with exit code 1.
• Build Aarch64 Linux Wheels / pytorch/audio / build-wheel-py3_10-cuda-aarch6412_8-aarch64 (gh)
  Process completed with exit code 1.
• Build Aarch64 Linux Wheels / pytorch/audio / upload / upload-wheel-py3_10-cuda-aarch6412_6-aarch64 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.10_cu126_aarch64
• Build Aarch64 Linux Wheels / pytorch/audio / upload / upload-wheel-py3_10-cuda-aarch6412_8-aarch64 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.10_cu128_aarch64
• Unit-tests on MacOS M1 CPU / tests / macos-job (gh)
  torchaudio_unittest/example/souce_sepration/wsj0mix_test.py::TestWSJ0Mix3::test_wsj0mix
• Unittests on Windows CPU / unittests-windows-cpu / windows-job (gh)
  torchaudio_unittest\example\souce_sepration\wsj0mix_test.py::TestWSJ0Mix3::test_wsj0mix
• Unittests on Windows GPU / unittests-windows-gpu / windows-job (gh)
  torchaudio_unittest\example\souce_sepration\wsj0mix_test.py::TestWSJ0Mix3::test_wsj0mix

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Aarch64 Linux Wheels / pytorch/audio / build-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh) (trunk failure)
  ImportError: libarm_compute.so: cannot open shared object file: No such file or directory
• Build Aarch64 Linux Wheels / pytorch/audio / upload / upload-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_audio__3.10_cu130_aarch64

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