NXP backend: Enable Neg with new Neutron flow

[roman-janik-nxp]

Summary

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

Test plan

Unit tests provided.

cc @robert-kalmar @JakeStevens @digantdesai @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20451

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❗ 1 Active SEVs

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• [ROCm] MI350 CI jobs will have longer queue times due to CI migration

❌ 2 New Failures, 3 Unrelated Failures

As of commit 6a6508a with merge base 252f57c ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t b8a2e0f810c6af9f8af5e06bd638d29631f7a294d5464d12559083e6712298b7 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t f36a424884399f3db19a6ae43871d5373290194af2605f6988da0ff87eeb9a53 /exec failed with exit code 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-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / 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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