Add conv+residual tests for add/sub ifm scaling (#18754)

[3l1]

Summary:

Add AddConvResidual and SubConvResidual test models (conv(x) + x, conv(x) - x) that exercise ifm scaling. The existing standalone Add/Sub tests (x+x, x+y) always have unit ifm scales.

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Reviewed By: digantdesai

Differential Revision: D99927633

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18754

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

❌ 4 New Failures, 1 Cancelled Job, 3 Unrelated Failures

As of commit bd56e80 with merge base 5707e2a ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model
• 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 b8f1f21e004b77a30d6d148ecbe32a50b2c4c920a60b2895fbf844ab37b89d76 /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 703769998f296f71425fd178058970b3701838377f2bc938e7baabf6500f22ed /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 ecf3f88a1a8d6d649dbe80b030b85ca70f727d43b1b8633d3412525e69f47334 /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-models-macos-coreml (efficient_sam) / macos-job (gh)
  ##[error]The operation was canceled.

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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[meta-codesync]

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[digantdesai]

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