Add staged package hashes

[tarun-google]

Add explicit hashes along with the location, name. Runner/workers use these for validating the files before downloading.

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[gemini-code-assist]

Summary of Changes

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This pull request introduces a crucial security and integrity enhancement by incorporating SHA256 hashes into the metadata of staged packages. This change allows the system's runners and workers to perform a cryptographic validation of package files prior to download, ensuring that the data remains untampered and consistent with its expected state.

Highlights

• Enhanced Package Integrity: Explicitly added SHA256 hashes to staged packages, alongside their location and name, to enable runners and workers to validate files before downloading.
• Dataflow Package Utility Updates: Modified PackageUtil to include the SHA256 hash when creating DataflowPackage attributes for files and bytes being staged, and when overriding package names.
• Test Coverage for Hashes: Updated PackageUtilTest to include assertions verifying that the SHA256 hash is correctly set and retrieved for staged packages.

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