VertexModels: "google/gemini-2.0-flash-exp" | "google/gemini-1.5-flash" | "google/gemini-1.5-pro" | "google/gemini-1.0-pro-vision" | "google/gemini-1.0-pro-vision-001" | "google/gemini-1.0-pro-002" | "google/gemini-1.0-pro-001" | "google/gemini-1.0-pro"