[Test] Port CPU decode_webp to stable ABI and retire the unstable image extension

[adabeyta]

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[pytorch-bot]

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❌ 1 New Failure, 1 Unclassified Failure

As of commit d9a32ff with merge base 3aadb2d ():

NEW FAILURE - The following job has failed:

• Tests / unittests-rocm (3.10, linux.rocm.gpu.gfx942.1, rocm, 7.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 69215ed2c98e481620c59cb5ab6291cdd164e1d560954201fc88d9b7a6271ca0 /exec failed with exit code 1

UNCLASSIFIED FAILURE - DrCI could not classify the following job because the workflow did not run on the merge base. The failure may be pre-existing on trunk or introduced by this PR:

• .github/workflows/pr-labels.yml (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)

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