Remove AWS Device Farm benchmark jobs

[GregoryComer]

Summary

Take down the AWS device farm benchmarking jobs. We are dropping them due to performance data being unreliable on non-rooted devices.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15433

• 📄 Preview Python docs built from this PR

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❗ 2 Active SEVs

There are 2 currently active SEVs. If your PR is affected, please view them below:

• Long queue for ROCM runners, also B200 and XPU queueing is observed
• B200 queuing was observed on Oct 29

❌ 1 New Failure, 1 Cancelled Job

As of commit 81b815a with merge base 2cafc34 ():

NEW FAILURE - The following job has failed:

• trunk / test-huggingface-transformers-macos (bert|coreml_fp32_gpu|--quantize) / macos-job (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128

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

• trunk / test-models-macos-coreml (ic3) / macos-job (gh)
  ##[error]The operation was canceled.

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[GregoryComer]

Note: I'm dropping the build-benchmark-app jobs, since they're built per benchmark run. If we want to keep those, I can move them to pull/trunk jobs to make sure they build. Let me know and I'll do that.