fix: Align Google GenAI auto traces with wrappers#1636

Luca Forstner (lforst) wants to merge 5 commits intomainbraintrustdata/braintrust-sdk-javascript:mainfrom

lforst/google-genai-paritybraintrustdata/braintrust-sdk-javascript:lforst/google-genai-parityCopy head branch name to clipboard