make partial export failure not stop cuda benchmark (#15939)

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.

Author: Gasoonjia

.github/workflows/cuda-perf.yml

@@ -179,6 +179,7 @@ jobs:
     needs:
       - set-parameters
       - export-models
+    if: always()
     uses: pytorch/test-infra/.github/workflows/linux_job_v2.yml@main
     permissions:
       id-token: write