Bump torchao pin and use v2 torchao tensors

[metascroy]

This PR bumps the torchao pin in ExecuTorch, and adjusts the code in ExecuTorch to rely less on deprecated features. In particular,

• torchao/experimental folder is being deprecated, so we switch embedding / tied embedding quantizers to their new home
• v1 tensors based on AffineQuantizedTensor + QDQLayout are being deprecated. This switches ExecuTorch to use v2 tensors. See Deprecation for IntxWeightOnlyConfig/Int8DynamicActivationIntxWeightConfig (version 1) and the models ao#2967.

[pytorch-bot]

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✅ You can merge normally! (19 Unrelated Failures)

As of commit 164f489 with merge base 56d5186 ():

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

• pull / unittest-buck / macos / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-llama-torchao-lowbit / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (efficient_sam, portable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (emformer_join, xnnpack-quantization-delegation) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (llama, portable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (llama2, xnnpack-quantization-delegation) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (llama3_2_vision_encoder, portable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (mobilebert, xnnpack-quantization-delegation) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (mv3, xnnpack-quantization-delegation) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (vit, xnnpack-quantization-delegation) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-macos-cpu (w2l, xnnpack-quantization-delegation) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-static-llama-ane / macos-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-openvino-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-samsung-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)

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[abhinaykukkadapu]

@metascroy can you try without a copy here, as the PR i landed should take care of this within the source transform stage.