Add feature flag for Chat workflow with Claude 4.0

Joey Khabierequested to merge
jkhabie-claude-4-chat-workflow-ff into master

What does this MR do and why?

This change adds a new feature flag called "duo_workflow_chat_workflow_claude_sonnet_4" that controls the availability of the Claude Sonnet 4 AI model in the Duo Workflow chat.

References

gitlab-org/modelops/applied-ml/code-suggestions/ai-assist#1158 (closed)

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