[1/4] Add ppl protos and setup dependencies

[wu-hui]

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[changeset-bot]

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Latest commit: 22415cc

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[github-actions]

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v8.0

[MarkDuckworth]

LGTM