[executorch] Update XNNPACK backend to use input_spec metadata + support HOPs

[GregoryComer]

Stack from ghstack (oldest at bottom):

• -> [executorch] Update XNNPACK backend to use input_spec metadata + support HOPs #18147
• [executorch] Update delegation and partitioning to use input_spec metadata #18146
• [executorch] Rewrite remove_unused_parameters_pass for HOP support #18145
• [executorch] Add propagate_input_spec pass and while_loop HOP support #18144
• [executorch] Fix remove_clone_ops to prevent output aliasing #18143

Update XNNPACK backend utilities to use input_spec node metadata for
identifying parameters and retrieving tensor data, with fallback to
graph signature for backward compatibility.

• is_param_node, get_param_tensor, get_tensor_name now use
  input_spec metadata, enabling correct operation inside HOP submodules
• XnnpackPartitioner adapted to renamed ConfigurationBasedPartitioner
  and recursive get_matched_nodes_from_configs(ep, gm) API
• New test_hop.py integration tests for cond, map, and scan delegation
• Example notebooks for cond and scan with XNNPACK

Differential Revision: D95876982

[pytorch-bot]

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❌ 22 New Failures

As of commit 6391151 with merge base 48bd687 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / windows (pybind) / build (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Build Presets / windows (windows) / build (gh)
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• pull / unittest / linux / linux-job (gh)
  extension/llm/modules/test/test_attention.py::AttentionTest::test_attention_torch_cond_executorch
• pull / unittest / macos / macos-job (gh)
  extension/llm/modules/test/test_attention.py::AttentionTest::test_attention_torch_cond_executorch
• pull / unittest / windows / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• pull / unittest-arm-backend-with-no-deps (test_pytest_ops_tosa) / linux-job (gh)
  RuntimeError: Command docker exec -t 2a9a6b6c3960958357c37526b40af0b8143998fcd436e9f918642bd4fc8b2e76 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
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• pull / unittest-editable / macos / macos-job (gh)
  extension/llm/modules/test/test_attention.py::AttentionTest::test_attention_torch_cond_executorch
• pull / unittest-editable / windows / windows-job (gh)
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• pull / unittest-nxp-neutron / linux-job (gh)
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• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 96c4b0fcf9ea99622c00249eb3a7e5da9ac453d2cc0ec16bbe1f4b64344fe29a /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-large-v3-turbo, quantized-int4-tile-packed) / linux-job (gh)
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• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 04f64c49c301fc0403f91aa35e131fd39bc519a87250726363604bb50d70793a /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-small, non-quantized) / linux-job (gh)
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• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t 1d73879e4c6e06054fc6d1b9ed7d57acfa64b399a1ae9dc05cb818557a1b0619 /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh)
  RuntimeError: Command docker exec -t 75f1608033379f7e150ec44f429e4e46270ca893f8803b3a06a58d263785f449 /exec failed with exit code 1
• Test CUDA Windows Export and E2E / test-model-cuda-windows-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Test CUDA Windows Export and E2E / test-model-cuda-windows-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-weight-only) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Test CUDA Windows Export and E2E / test-model-cuda-windows-e2e (mistralai, Voxtral-Mini-4B-Realtime-2602, quantized-int4-tile-packed) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Test CUDA Windows Export and E2E / test-model-cuda-windows-e2e (nvidia, diar_streaming_sortformer_4spk-v2, non-quantized) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Test CUDA Windows Export and E2E / test-model-cuda-windows-e2e (nvidia, parakeet-tdt, non-quantized) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1
• Test CUDA Windows Export and E2E / test-model-cuda-windows-e2e (nvidia, parakeet-tdt, quantized-int4-weight-only) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 1

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