fix: typo in find_package for webp and remove avif from CMake

[rdong8]

• Fix typo in find_package: WEBP -> WebP
• Remove AVIF since that has already been moved to torchvision-extra-decoders and is unused here

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9193

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 2 Unrelated Failures

As of commit 77efed1 with merge base 48b2f9f ():

NEW FAILURE - The following job has failed:

• Docs / build / linux-job (gh)
  At least one of the pre-conditions you specified did not hold

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/vision / build-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh) (trunk failure)
  Process completed with exit code 1.
• Build Aarch64 Linux Wheels / pytorch/vision / upload / upload-wheel-py3_10-cuda-aarch6413_0-aarch64 (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_vision__3.10_cu130_aarch64

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[scotts]

@rdong8, good catch on both fronts! It does look like your change is what we're supposed to do. See: https://chromium.googlesource.com/webm/libwebp/+/HEAD/doc/building.md

[github-actions]

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