feat: add google-vertex-openapi provider with ADC authentication#10303

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leehack wants to merge 3 commits intoanomalyco:devfrom

leehack:fix/vertex-glm-openapi

Commits on Jan 29, 2026

fix(provider): add google-vertex-openapi provider for GLM-4 model support
leehack
committed
refactor: use ADC with google-auth-library instead of gcloud subprocess
leehack
committed
Consolidate the provider into google-vertex
leehack
committed