Arm backend: Add MOD_SHAPE backend dialect op

[oscarandersson8218]

Adds new TOSA backend dialect op for MOD_SHAPE. MOD_SHAPE computes arg0 modulo arg1, i.e:
def MOD_SHAPE(arg0, arg1):
out_shape = []
for dim0, dim1 in zip(arg0, arg1):
out_shape.append(dim0 % dim1)
return out_shape

Change-Id: I2f934eb251263a1973a0fc6c3d7723c8fb2a7bc1

cc @digantdesai @freddan80 @per @zingo @mansnils @Sebastian-Larsson @robell

[pytorch-bot]

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• Rolling out OSDC (ARC) runners on pull workflow for PyTorch trunk commits

❌ 6 New Failures, 3 Unrelated Failures

As of commit 8ad8815 with merge base 37b12c8 ():

NEW FAILURES - The following jobs have failed:

• Apple / build-frameworks-ios / macos-job (gh)
  No files were found with the provided path: /Users/runner/work/_temp/artifacts/. No artifacts will be uploaded.
• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t f26008b4cae2749ed4b38de6d5ff6cd3ca82a798f3c0a04a4e0f88bd93353f67 /exec failed with exit code 139
• trunk / test-torchao-huggingface-checkpoints (lfm2_5_1_2b, linux.arm64.2xlarge, executorch-ubuntu-22.04-g... / linux-job (gh)
  RuntimeError: Command docker exec -t 0fa5d314024fad6728be3e9a3858bce5dcd24a367d71674f85fea53f2c1e6e1e /exec failed with exit code 1
• trunk / test-torchao-huggingface-checkpoints (phi_4_mini, linux.arm64.2xlarge, executorch-ubuntu-22.04-gc... / linux-job (gh)
  RuntimeError: Command docker exec -t 6e88418f0bf4f86d8a1372b20f6fd1a61ca50dbbb9511bb37848c24fe455b965 /exec failed with exit code 1
• trunk / test-torchao-huggingface-checkpoints (qwen3_4b, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc1... / linux-job (gh)
  RuntimeError: Command docker exec -t af74961a36f853d4dc88f5df3f4be14e4f30f6cd3c9805986accd92ab16d19c3 /exec failed with exit code 1
• trunk / unittest-release / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model

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

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

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[oscarandersson8218]

Unrelated failures.