Remove prototype from release/0.20 branch

[NicolasHug]

No description provided.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8657

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❌ 2 New Failures, 5 Unrelated Failures

As of commit 43322c0 with merge base db5f8a0 ():

NEW FAILURES - The following jobs have failed:

• Lint / bc (gh)
• Lint / c-source / linux-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cuda11_8 (gh) (detected as infra flaky with no log or failing log classifier)
• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cuda12_1 (gh) (detected as infra flaky with no log or failing log classifier)
• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cuda12_4 (gh) (detected as infra flaky with no log or failing log classifier)
• CMake / macos (macos-m1-stable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

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[kit1980]

This broke lint