Arm backend: Add 16A8W support and test for tanh 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 tanh operation in ExecutorTorch ARM backend.

This follows the pattern established for linear, mul, and sigmoid operations, extending int16 support to tanh operations.

Changes:

• Add INT16 dtype validation support in op_tanh.py
• Add test_tanh_tensor_16a8w_tosa_INT test function
• Enable test_tanh.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: D80510815

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13797

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❌ 13 New Failures, 3 Unrelated Failures

As of commit 1a048c5 with merge base 6208340 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 6ebbca745bd2514b47ebfebbad788d92c21f1b1ebbae659fd329a2970cecd422 /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 e00f101a14031c2950391f5788cae12674946a0cd71fabf5fc711a9dc89e7672 /exec failed with exit code 3
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 1e80c656f4358637759ec649a623292ffb0ab890255ad7b1cacc0a4b85fec629 /exec failed with exit code 3
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t d9b894335d79876af5d27d7341ddf9191c7e858774bb6e777e0fa327a2e93ca5 /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 6a6ecea5629b215820d5dbb44ec8f2012c41ad95b5df613a6c3ee54900654cb1 /exec failed with exit code 3
• trunk / test-arm-backend (test_pytest_ops_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t ce0bd163a8703c6c4b071eed1068b6f194eac0bb41a5e15a80f8a1e9e9aec754 /exec failed with exit code 3
• trunk / test-arm-backend (test_smaller_stories_llama) / linux-job (gh)
  RuntimeError: Command docker exec -t 059dc1b0c99200891d65b92ec04846f1fb83e0e57326042cb8535c6c83c2d79d /exec failed with exit code 3
• trunk / test-coreml-delegate / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-huggingface-transformers-coreml (olmo-1b|coreml_fp32_gpu|--quantize) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / unittest-release / linux / linux-job (gh)
  RuntimeError: Command docker exec -t b28287aa21c53243938c8f37014b5671c54cdce4da21bdab4f74eb6013dad67a /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

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This pull request was exported from Phabricator. Differential Revision: D80510815

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