[ET-VK][ez] Add support for auto_functionalized_v2

[pytorchbot]

Summary:
Update the Vulkan partitioner to recognize torch.ops.higher_order.auto_functionalized_v2
in addition to the existing auto_functionalized op when determining operator support
and extracting target names for custom operators.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16794

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❌ 8 New Failures, 1 Cancelled Job

As of commit 3c7ff30 with merge base 7492d0d ():

NEW FAILURES - The following jobs have failed:

• pull / test-coreml-bc-macos (macos-m2-stable) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / test-samsung-quantmodels-linux / linux-job (gh)
  RuntimeError: Command docker exec -t b5d6a0dbe09e1779501a9cdfd3c14a39e8611ddbf9398627f141c9e45f7d9988 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 51c7b4e7f2f2e2bc29c318f153490522e5a2991b981ea851cfef375edbc2395f /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 4873007b1745471a2e6931fce067a362618dffa68f67e8ce8ade6a458f2900fb /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 281f7ae3ff2720a3b0fc55cc54abd0b21f655f91b63cdee1d948de5040ca731e /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t d6a61d6038993ee6cf25716b97a9118174faa4c17a516f037ca7bbc6da015093 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 406416e035ae8550f2dcb481ea3bf9e95f43c4a6dd66fd5440a4de5a6a7adf5c /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t af4063e11c67cf298b36ad4005ae1abebfd3f04f483cdf82b7ce732fb92be2ff /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / unittest-editable / macos / macos-job (gh)
  ##[error]The operation was canceled.

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[SS-JIA]

Note that test failures are not relevant to this change