openapi/upload: attach commit, repository, and branch as S3 metadata

[reakaleek]

What

• Add commit and branch inputs to the OpenAPI upload action
• Store commit, repository, and branch as S3 object metadata on every uploaded spec

Why

• Downstream tools need provenance (which commit and branch produced a spec) without parsing the S3 object key
• The S3 key version segment can differ from the git branch (for example ECE-4.1 maps to 4.1), so branch must be a separate metadata field

Notes

• Existing workflows need no changes — defaults come from github.sha and github.ref_name
• Metadata keys: x-amz-meta-commit, x-amz-meta-repository, x-amz-meta-branch

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