Arm backend: Add 16A8W support and test for cat operation

[Ninja91]

Stack from ghstack (oldest at bottom):

• Arm backend: Add INT16 support to rescale operation #13802
• Arm backend: Add 16A8W FCNode support with BMM dependency fix #13801
• -> Arm backend: Add 16A8W support and test for cat operation #13800
• Arm backend: Add 16A8W support for view and transpose operations #13799
• Arm backend: Add 16A8W support and test for slice operation #13798
• Arm backend: Add 16A8W support and test for tanh operation #13797
• Arm backend: Add 16A8W support and test for sigmoid operation #13796
• Arm backend: Add 16A8W support and test for mul operation #13795
• Arm backend: Add 16A8W support and test for add operation #13789

Add 16A8W quantization support and test for the cat operation in ExecutorTorch ARM backend.

This follows the pattern established for linear, mul, sigmoid, tanh, slice, and view/transpose operations, extending int16 support to cat operations.

Changes:

• Add test_cat_tensor_16a8w_tosa_INT test function
• Enable test_cat.py in test targets configuration

The 16A8W configuration uses 16-bit activations with 8-bit weights, enabling higher precision for activations while maintaining weight efficiency.

Differential Revision: D80511455

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13800

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❌ 12 New Failures, 4 Unrelated Failures

As of commit a237e06 with merge base 6208340 ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t d55c3d6b26be5c3e57e7fa934cf03a420156453003f82ea3010f991f6251365f /exec failed with exit code 3
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 4c7f97f1239ae246ec37ff6ed541be73169e9c025eb8ba63738f5f32c600bc9a /exec failed with exit code 3
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 246bc6e0e9ef53416c984d1390a127fc4d914d08d7f808747fb4fec6e85fab0a /exec failed with exit code 3
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 8f51bbf88dd487ce73c8e492c64fdd09bd727217588fa548e15dbf73099aba8d /exec failed with exit code 3
• pull / unittest-editable / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3
• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t ad4e6e0252823cb5de327c8dd13f3a864f418616db929455d910f70c6d86f7f9 /exec failed with exit code 3
• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t 534bd1d26dba72f01e298a96903046e94184fc4f0cf507e341d8c0105a56782a /exec failed with exit code 3
• trunk / test-arm-backend (test_smaller_stories_llama) / linux-job (gh)
  RuntimeError: Command docker exec -t a0a435b7020a286a854024d8ee68cef86f0bcc8843a23767f85d931bcfd11488 /exec failed with exit code 3
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t bb5d89cf887d20e46525f702042409f026735d1880cedfb01b5df4bf08afa866 /exec failed with exit code 3
• trunk / unittest-release / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 3

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

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

• Apple / build-benchmark-app / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-frameworks-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-coreml-delegate / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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This pull request was exported from Phabricator. Differential Revision: D80511455

[digantdesai]

code dedup again :)