google_ai: Refactor token count methods in Google AI (#45184)
The change simplifies the `max_token_count` and `max_output_tokens`
methods by grouping Gemini models with identical token limits.
Release Notes:
- N/A
225a2a8a20Xiaobo Liu committed on 12/18/2025, 2:12:40 AM· committed by GitHubparentea37057