Add hashes for staged files and relevant validations in boot

[tarun-google]

GitHub Actions Tests Status (on master branch)

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[gemini-code-assist]

Summary of Changes

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This pull request enhances the Dataflow runner by adding SHA-256 hash validation for staged files. This change improves the integrity and security of artifacts used in Dataflow pipelines by ensuring that the files retrieved during pipeline execution match the expected hashes. The changes span across the Java, Go, and Python SDKs to ensure consistency across all supported languages.

Highlights

• Staged File Hashes: This PR introduces SHA-256 hashes for staged files in the Dataflow runner, enhancing artifact verification.
• Go SDK Integration: The Go SDK now injects full pipeline options into the context and extracts artifact hashes for validation.
• Java SDK Integration: The Java SDK now sets artifact hashes in the Dataflow pipeline options.
• Python SDK Integration: The Python SDK now includes artifact hashes when creating job descriptions.

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