Skip libavif/libheic tests

[NicolasHug]

They're failing with

2025-03-17T12:56:28.1186348Z �[31mFAILED�[0m test/test_image.py::�[1mtest_decode_avif[decode_avif]�[0m - OSError: /opt/conda/envs/ci/bin/../lib/libstdc++.so.6: version `GLIBCXX_3.4.31' not found (required by /opt/conda/envs/ci/lib/python3.10/site-packages/torchvision_extra_decoders/../torchvision_extra_decoders.libs/libheif-2b91cd5e.so.1)

As mentioned in #8963:

As a first step I'll deactivate the tests but I'll also try to look into building torchvision-extra-decoder` with older dependencies (libheif, libavif) which hopefully won't require recent version symbols.

[pytorch-bot]

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[github-actions]

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