NXP backend: Test Mul Tensor with new Neutron flow

[roman-janik-nxp]

Summary

Add tests verifying correct support for mul.tensor by the Neutron backend using the new Neutron MLIR flow.

Test plan

Unit tests provided.

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19336

• 📄 Preview Python docs built from this PR

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❌ 5 New Failures, 7 Unrelated Failures

As of commit 327bf60 with merge base 1debeb6 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh)
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x64
• pull / test-coreml-bc-macos (macos-m1-stable) / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1
• pull / test-qnn-delegate-linux / linux-job (gh)
  backends/qualcomm/tests/test_qnn_delegate.py::TestQNNFloatingPointOperator::test_qnn_backend_argmax
• pull / unittest-buck / macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-qnn-testsuite-linux / test-backend-linux (qnn, models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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

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

• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / windows / windows-job (gh) (trunk failure)
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
• Test CoreML Backend / test-coreml / test-backend-macos (coreml, models) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• Test CoreML Backend / test-coreml / test-backend-macos (coreml, operators) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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