This PR removed the unused protobuf definition for spanner.py for ingestion helper

[shixiao-coder]

No description provided.

[gemini-code-assist]

Code Review

This pull request simplifies the Spanner database initialization by removing the loading and passing of proto descriptors (storage.pb) during the DDL update process. The corresponding unit tests have been updated to remove the mock file handling for the proto file. I have no feedback to provide.

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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🟢 Metrics -4 complexity

Metric	Results
Complexity	-4

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