make partial export failure not stop cuda benchmark

[Gasoonjia]

Before:
When running CUDA benchmarks on multiple models, any model export failure would halt the entire benchmark job.

After:
With the new configuration, the benchmark job will continue for models that export successfully, even if some models fail to export.

[pytorch-bot]

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✅ You can merge normally! (3 Unrelated Failures)

As of commit 0ce31d4 with merge base 3ef13a3 ():

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

• Test Metal Backend / test-model-metal-e2e (mistralai, Voxtral-Mini-3B-2507, non-quantized) / macos-job (gh) (matched macos rule in flaky-rules.json)
  File doesn't exist

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

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module

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