Add Arm & NXP usernames for excluding contributors

[nil-is-all]

Irina Korchakova - irtrukhina
Rob-Hughes-Arm
aliafzal - Meta

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18503

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❌ 2 New Failures, 2 Unrelated Failures

As of commit 4a33ba5 with merge base 3d2c853 ():

NEW FAILURES - The following jobs have failed:

• pull / test-multimodal-linux (gemma3-4b) / linux-job (gh)
  RuntimeError: Command docker exec -t 290e3ab1c7847cd9db40b64b08b69483f1e081388a36d2751a48e256945169fb /exec failed with exit code 139
• pull / unittest-editable / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv3_model

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

• pull / unittest / windows / windows-job (gh) (matched win rule in flaky-rules.json)
  ##[error]The operation was canceled.

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

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

• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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