Revert "[Benchmark] fail test if model artifact does not exist"

[yangw-dev]

Reverts #8482

The issue is fixed by Fixes #8125, which catch the app error at test level

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8985

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❌ 4 New Failures, 1 Cancelled Job

As of commit 7ea3a88 with merge base 6170804 ():

NEW FAILURES - The following jobs have failed:

• apple-perf / benchmark-on-device (llama, coreml_fp16, apple_iphone_15, arn:aws:devicefarm:us-west-2:3085353851... / mobile-job (ios) (gh)
  Process completed with exit code 22.
• apple-perf / benchmark-on-device (llama, xnnpack_q8, apple_iphone_15, arn:aws:devicefarm:us-west-2:30853538511... / mobile-job (ios) (gh)
  Process completed with exit code 22.
• apple-perf / build-benchmark-app / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 23
• apple-perf / upload-benchmark-results (gh)
  Process completed with exit code 1.

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

• apple-perf / export-models (llama, coreml_fp16, apple_iphone_15, arn:aws:devicefarm:us-west-2:308535385114:dev... / macos-job (gh)
  ##[error]The operation was canceled.

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