clean up prototype folder

[jcaip]

remove prototype folder from sparsity, use prototype/sparsity instead

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/2232

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❌ 7 New Failures

As of commit 3ee2615 with merge base 04fb450 ():

NEW FAILURES - The following jobs have failed:

• Run Float8 Tests / test (SM-89, linux.g6.4xlarge.experimental.nvidia.gpu, --pre torch --index-url https://download.p... / linux-job (gh)
  RuntimeError: Command docker exec -t 243767c6c740cabb7e8d2fb095cdae6865a54ab805e84990eb8e6379e7a58e72 /exec failed with exit code 139
• Run Regression Tests / test (CPU 2.6, linux.4xlarge, torch==2.6.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 85eb0d7a63d2e74eb797433274f20e60d3ef1edec1cb26da5e31999646f56a04 /exec failed with exit code 139
• Run Regression Tests / test (CPU 2.7, linux.4xlarge, torch==2.7.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 1597a6ca5638207b75a5b630848176ee9807f94562a8459fac5007a2bf5486af /exec failed with exit code 139
• Run Regression Tests / test (CUDA 2.6, linux.g5.12xlarge.nvidia.gpu, torch==2.6.0, cuda, 12.6) / linux-job (gh)
  RuntimeError: Command docker exec -t c87702c85468054fc8941a1b8b34d74471b364837c7afb514d060128fa0e76b7 /exec failed with exit code 139
• Run Regression Tests / test (CUDA 2.7, linux.g5.12xlarge.nvidia.gpu, torch==2.7.0, cuda, 12.6) / linux-job (gh)
  RuntimeError: Command docker exec -t 0711867677d129bf9eaf0146087c87312af7b8522b9d5a992b38a791d38d12f3 /exec failed with exit code 139
• Run Regression Tests / test-nightly (CPU Nightly, linux.4xlarge, --pre torch --index-url https://download.pytorch.org/wh... / linux-job (gh)
  RuntimeError: Command docker exec -t 3cc22e46e6c3c0c8f604b016cc4185ccac6c503a7af31f2e2267e568323990c1 /exec failed with exit code 139
• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh)
  RuntimeError: Command docker exec -t 5c5a86963e31b79cc15cc26bb1aa034bf0a681eeb467d82b10972a2dc9047000 /exec failed with exit code 139

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