forward fix executorch slice copy tests

[pianpwk]

Summary:
T230513957

D77745298 made it so less no-op slices are emitted by export in the first place

Reviewed By: mcr229, GregoryComer

Differential Revision: D78103869

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12354

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❌ 5 New Failures, 3 Unrelated Failures

As of commit 3deeeb9 with merge base 540fa5d ():

NEW FAILURES - The following jobs have failed:

• Lint / android-java-format / linux-job (gh)
  Process completed with exit code 1.
• pull / unittest / linux / linux-job (gh)
  backends/xnnpack/test/ops/test_slice_copy.py::TestSliceCopy::test_fp32_slice_copy_stride_non_1
• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_slice_copy.py::TestSliceCopy::test_fp32_slice_copy_stride_non_1
• pull / unittest-editable / linux / linux-job (gh)
  backends/xnnpack/test/ops/test_slice_copy.py::TestSliceCopy::test_fp32_slice_copy_stride_non_1
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_slice_copy.py::TestSliceCopy::test_fp32_slice_copy_stride_non_1

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

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

• pull / test-eval_llama-mmlu-linux / linux-job (gh) (trunk failure)
  RuntimeError: Dataset scripts are no longer supported, but found mmlu_no_train.py
• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-models-linux (mobilebert, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D78103869

[digantdesai]

Thank you.