Turn off v2 API on prod

[juliawu]

Reverts #6317 and turns off the use_v2_api flag in production.

[gemini-code-assist]

Summary of Changes

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This pull request reverts the recent enablement of the V2 API in the production environment by updating the feature flag configuration to ensure stability.

Highlights

• Feature Flag Update: Disabled the use_v2_api feature flag in the production configuration.

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[gemini-code-assist]

Code Review

This pull request disables the use_v2_api feature flag in the production configuration. There are no review comments to address.