NXP backend: Add prelu support using new neutron flow

[roman-janik-nxp]

Summary

Only last 2 commits apply. Requires NXP backend: Improve test result gathering#20024 PR to be merged. Add tests verifying correct support for prelu by the Neutron backend using the new Neutron MLIR flow

Test plan

Unit tests provided.

cc @robert-kalmar

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20301

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❌ 5 New Failures, 4 Unrelated Failures

As of commit 1812e29 with merge base c9ef423 ():

NEW FAILURES - The following jobs have failed:

• pull / test-lora-multimethod-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 0acc7fa8e1a7b6164a22047bd30551afbc34c342aa79defa9d2a82c60d2a4f21 /exec failed with exit code 1
• pull / test-qnn-models-linux (mv2) / linux-job (gh)
  RuntimeError: Command docker exec -t 9e4589d23e52bdfa5d7d60f17bebc2e102c75ef7a3cfb85da4a106a7be4736f8 /exec failed with exit code 92
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 39dc19f9f1d5a6d5a02b159b2dcc77858ca321acff9f0ca73fcbcadbc5680d09 /exec failed with exit code 1
• pull / unittest / windows / windows-job (gh)
  examples/models/test/test_export.py::ExportTest::test_efficient_sam_export_to_executorch
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 409d425a9ddba084b201f71d6b0b8424136d3a3b110d4fcf22cdad08781d5ce5 /exec failed with exit code 1

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

• pull / test-models-linux (llama3_2_vision_encoder, portable, linux.4xlarge.memory) / 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 / 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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