[ET-VK] Reorganize op_registry.py by C++ implementation file

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK] Add supports_highdim field to OpFeatures #17337
• [ET-VK] Add per-operator dtype constraints to op_registry #17336
• -> [ET-VK] Reorganize op_registry.py by C++ implementation file #17335

Previously, operator registrations were grouped by shared OpFeatures
characteristics, which made it difficult to verify that registrations
accurately reflected the capabilities of their C++ implementations. For
example, operators from different C++ files (View.cpp, Squeeze.cpp,
Clone.cpp, Gather.cpp) were grouped together in a single registration
because they happened to share the same storage requirements.

This reorganization groups registrations by their C++ implementation file,
making it straightforward to cross-reference Python registrations with
their corresponding C++ code. When an operator's C++ implementation changes,
the relevant Python registration is now easy to locate and update.

Key changes:

• Added section headers indicating the C++ file for each registration group
• Split registrations where operators mapped to different C++ files (e.g.,
  MatMul.cpp vs Linear.cpp, Reduce.cpp vs ArgReduce.cpp)
• Adopted consistent naming: register_<cpp_file>_cpp_ops() for grouped
  registrations, register_<op_name>() for single-op registrations
• Kept separate registrations for ops with different characteristics even
  when they share a C++ file (e.g., permute vs permute_copy have different
  storage requirements)

Authored with Claude Code.

Differential Revision: D92740293

[pytorch-bot]

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❌ 7 New Failures, 2 Unrelated Failures

As of commit af891cc with merge base ba89c69 ():

NEW FAILURES - The following jobs have failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7be1a64654368b68fa20e17655d277b79e80ff8648502f4f59a59a03a6b56cf1 /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 9c44b8239bba2387536ff3cf59c9548c04986a6f5efa60fee175880c25130ae1 /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 2b145e01e48a434fefa9b42326e93e84f89e32a4c8da62cf35f2a3f56f596af1 /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 505be7344560ccaa7a959278a1959b76a0a30c24d74738e607e3a46dd24ddac8 /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 15eb8aa44822eaa3855793594173ca413b37ab8e601d17dea28a7172d5d244cf /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 5ed1976039e6271f38f5b8d815d8edb670278bb2f53d6b3df33cd9af34a46e97 /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 43c119d19ce72b1d19c18538ee03d2c0abc3e885791bb22085d6ee589d00835e /exec failed with exit code 1

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

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

• Test Metal Backend / test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• Test Metal Backend / test-model-metal-e2e (openai, whisper-small, non-quantized) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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