ci: use production S3 bucket for binary uploads

[yanghang8612]

Summary

• route all binary uploads to the production S3 bucket
• remove the release-branch selection of the test bucket
• keep the existing commit-SHA object prefix unchanged

Why

The upload pipeline no longer distinguishes between production and test environments. Release branches should therefore use S3_BUCKET_PROD instead of S3_BUCKET_TEST. This also avoids the KMS authorization failure encountered when uploading to the test bucket.

Impact

Both develop and release_* workflow runs upload release artifacts to the production bucket under ${{ github.sha }}/.

Validation

• parsed .github/workflows/build.yml as YAML
• ran git diff --check
• confirmed the commit changes only .github/workflows/build.yml

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