Model Updates

[jexp]

• GPT 5.1 (mini)
• Gemini 2.5 (remove the 1.5 and 2.0) - 3.0 if available in API
• Sonnet 4.5
• others accordingly

[cgoguyerkd]

Can you update as well embeddings models ?
vertexai "embedding-gecko@003" has been replaced by Gemini "gemini-embedding-001".

[prakriti-solankey]

Merged to Dev