[bc-breaking] update default int8 tensor version to v2

[jcaip]

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[pytorch-bot]

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❌ 12 New Failures

As of commit 04a1cf2 with merge base c4273fe ():

NEW FAILURES - The following jobs have failed:

• Run 1xH100 Tests / test (H100, linux.aws.h100, --pre torch torchvision torchaudio fbgemm-gpu-genai --index-url https... / linux-job (gh)
  test/integration/test_integration.py::TestSaveLoadMeta::test_save_load_int8woqtensors_5_cuda
• Run 1xL4 Tests / test (SM-89, linux.g6.4xlarge.experimental.nvidia.gpu, --pre torch --index-url https://download.p... / linux-job (gh)
  test/integration/test_integration.py::TestSaveLoadMeta::test_save_load_int8woqtensors_5_cuda
• 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 6fd32d9dbd02fcca2bee71618c1b86948af9ad6994a64789c336a41f6df3414d /exec failed with exit code 2
• Run Regression Tests / test (CPU 2.7, linux.4xlarge, torch==2.7.1 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 77f433a06591f93d8ae8f5589533ed9ca881eb9c13ffc9fd40d4abf35c7fc527 /exec failed with exit code 2
• Run Regression Tests / test (CPU 2.8, linux.4xlarge, torch==2.8.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t 1e9c72848de3471157517ed57f614aca838e5f7f22392c18e670b9cd04c72834 /exec failed with exit code 2
• Run Regression Tests / test (CPU 2.9, linux.4xlarge, torch==2.9.1 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh)
  RuntimeError: Command docker exec -t cc1aa0be944fd09b2cad59283fa4fdb0efbf8fe36504d9290231e80905982504 /exec failed with exit code 2
• 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 310471ff7535facbe5dd7b55cfa7a35d7e1cbb0a76f9c1a04d39aceccc7817e7 /exec failed with exit code 2
• Run Regression Tests / test (CUDA 2.7, linux.g5.12xlarge.nvidia.gpu, torch==2.7.1, cuda, 12.6) / linux-job (gh)
  RuntimeError: Command docker exec -t 63ff4f06a6289219d2a6eed7c7089ef769bbe75562e92e7935abdd27bdfe07b1 /exec failed with exit code 2
• Run Regression Tests / test (CUDA 2.8, linux.g5.12xlarge.nvidia.gpu, torch==2.8.0, cuda, 12.6) / linux-job (gh)
  RuntimeError: Command docker exec -t 9e09782a7aa664be6dcb015500aee4c648d8a57412d607cb1cb0c0eda01c1a05 /exec failed with exit code 2
• Run Regression Tests / test (CUDA 2.9, linux.g5.12xlarge.nvidia.gpu, torch==2.9.1, cuda, 12.6) / linux-job (gh)
  RuntimeError: Command docker exec -t 5972945d8ba86a679c1b11f22eb212fa75c6c22d6b615460d1ee76e6c691057c /exec failed with exit code 2
• 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 1dd6f601aa5fc730e9334a54c4bb89450876c275356e2e4ff9d053144fba847d /exec failed with exit code 2
• 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 dddf446fac4612fe24c2658ecf5370337496b60f034bcd8c871ca92e6c9690ab /exec failed with exit code 2

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[jerryzh168]

will also need to change all these old tests to use v1, e.g. in https://github.com/pytorch/ao/blob/main/test/dtypes/test_affine_quantized.py