Upload the benchmark result to S3 and post the URL (#84726)
Upload the benchmark result to S3 and make it accessible to the public.
The URL is available at the end of the "Upload to S3" step of the workflow. For example, this PR uploads 3 files:
```
Uploaded the result file control.json to https://ossci-metrics.s3.amazonaws.com/torchbench-pr-test/pr84726/control.json
Uploading file treatment.json to S3 with key: torchbench-pr-test/pr84726/treatment.json
Uploaded the result file treatment.json to https://ossci-metrics.s3.amazonaws.com/torchbench-pr-test/pr84726/treatment.json
Uploading file result.csv to S3 with key: torchbench-pr-test/pr84726/result.csv
Uploaded the result file result.csv to https://ossci-metrics.s3.amazonaws.com/torchbench-pr-test/pr84726/result.csv
```
RUN_TORCHBENCH: nvfuser
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84726
Approved by: https://github.com/davidberard98
