Delete obsolete code for deprecated endpoint /v1/bulk/observation-existence

[n-h-diaz]

The endpoint was deprecated in Apigee in https://github.com/datacommonsorg/mixer/pull/1711/files and has no references or requests

[gemini-code-assist]

Summary of Changes

Hello @n-h-diaz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on removing all traces of the /v1/bulk/observation-existence endpoint, which was previously marked as deprecated. The changes encompass the removal of its protobuf definition, gRPC service interfaces and implementations, server-side handler, and related test files. This systematic deletion streamlines the codebase by eliminating unused components, enhancing maintainability, and reducing the overall project footprint.

Highlights

• Endpoint Removal: The /v1/bulk/observation-existence endpoint and all associated code have been completely removed from the codebase.
• Code Cleanup: This pull request performs a significant cleanup by deleting obsolete protobuf definitions, gRPC service implementations, and server-side handler logic for a previously deprecated endpoint.
• Test Artifacts Removed: Corresponding golden test data and test files for the removed endpoint have also been deleted, ensuring no lingering test cruft.

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[gemini-code-assist]

Code Review

The pull request successfully removes all traces of the deprecated /v1/bulk/observation-existence endpoint. This includes the RPC definition in mixer.proto, its corresponding generated Go code in mixer.pb.go and mixer_grpc.pb.go, the handler implementation in handler_v1.go, and the related golden test files. The changes are clean and align with the objective of deleting obsolete code.