Update upload-benchmark-results to use local action paths

[malfet]

Some people might argue that referencing @main is not secure But it also can uncover some subtle bugs or create weird conflict if someone uses actionl.yml@sha which is not equal to main

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
torchci	Ignored	Preview	May 15, 2026 4:42am

[huydhn]

Hmm, the test failed https://github.com/pytorch/test-infra/actions/runs/25886833107/job/76080537025?pr=8081#step:3:2. This syntax doesn't seem to work when upload-benchmark-results is used as a local GHA

- name: Test upload the benchmark results
  uses: ./.github/actions/upload-benchmark-results
  with:
    benchmark-results-dir: .github/scripts/benchmark-results-dir-for-testing/v3
    schema-version: v3
    dry-run: true
    github-token: ${{ secrets.GITHUB_TOKEN }}

https://github.com/pytorch/test-infra/blob/main/.github/workflows/test_upload_benchmark_results.yml#L32

[huydhn]

This doesn't seem to work when using the upload-benchmark-results GHA locally like https://github.com/pytorch/test-infra/blob/main/.github/workflows/test_upload_benchmark_results.yml#L32