Update the code to only do single time feature flag call within 1 Gemini client

[shixiao-coder]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request optimizes how feature flags are handled when interacting with the Gemini client. By shifting the responsibility of checking the feature flag to the call sites, the code reduces redundant checks and improves the modularity of the Gemini utility functions.

Highlights

• Refactored Feature Flag Logic: Moved the feature flag check for Gemini 3 thinking configuration out of the utility function and into the calling modules.
• Improved API Flexibility: Updated the call_gemini and get_gemini_config functions to accept a use_thinking_config boolean parameter, allowing callers to explicitly control the configuration.

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[gemini-code-assist]

Code Review

This pull request refactors the Gemini configuration logic by moving the feature flag check for 'thinking configuration' from the utility layer to the calling sites in overview.py and related.py. The call_gemini and get_gemini_config functions now explicitly accept a use_thinking_config boolean parameter. Feedback was provided regarding the call_gemini docstring, which incorrectly documents a retries parameter that is not present in the function signature or implementation.