Remove feature flag duo chat react agent claude 4

What does this MR do and why?

This change removes a feature flag called "duo_chat_react_agent_claude_4_0" that was related to Claude 4.0 AI capabilities in Duo Chat. The feature flag file is being completely deleted, and a line that pushed this feature flag to the AI Gateway service has been removed from the chat completions code. This suggests that either the feature is being permanently enabled, completely removed, or implemented differently without needing this specific feature flag.

References

#546256 (closed)

chore: clean up duo_react_feature_flag code (gitlab-org/modelops/applied-ml/code-suggestions/ai-assist!2746 - merged)

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