NXP backend: Add use new flag to custom compilation options, add op aliases

[roman-janik-nxp]

Summary

Adds new flag use_new_flow_neutron_c to CustomDelegationOptions, enable passing it in to_quantized_edge_program() for using new Neutron converter conversion flow. Adds ops aliases for more readable tests. Depends on #19112, only last commit is from this PR.

Test plan

No tests at the moment, they will be added for each op.

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19184

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❌ 1 Cancelled Job, 3 Unrelated Failures

As of commit dc7be2b with merge base eb19f24 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-models-linux (ic4, xnnpack-quantization-delegation, linux.4xlarge.memory) / linux-job (gh)
  ##[error]The operation was canceled.

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-voxtral-realtime-xnnpack-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[MartinPavella]

Please rebase onto the latest #19112 where the CI is fixed.

[roman-janik-nxp]

The failing checks seem unrelated and the internal CI is passing. Merging.