Fix test spec for scheduled jobs

[guangy10]

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[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/4734

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❌ 2 New Failures, 1 Pending

As of commit a951276 with merge base caadd81 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-runner-qnn-linux (fp32, cmake, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t a709377084d255cad707a87c576b5cf41d7998393976a2f0d7806678348902c1 /exec failed with exit code 2
• pull / unittest-arm (buck2) / linux-job (gh)
  ../../dev/ops/test_depthwise_conv.py::TestDepthwiseConv2D::test_dw_conv2d_tosa_BI_5_two_dw_conv2d

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[guangy10]

pull / test-llama-runner-qnn-linux is failing. IIUC #4662 is backed out, so should this job relying on qnn be disabled as well? @cccclai

[guangy10]

Merged to #4736