Add VS Code Agents to Copilot usage metrics

Automated excerpt

GitHub Copilot usage metrics reports now include generally available metrics for activity in the dedicated VS Code Agents window, helping you measure adoption and engagement across enterprises and organizations. daily_active_vscode_agent_users: An optional count of unique users active in the VS Code Agents window each day. totals_by_vscode_agent: Optional aggregate of session_count and total_user_messages values. used_vscode_agent: An optional indicator of whether the user used the VS Code Agents window. totals_by_vscode_agent: Optional per-user session_count and total_user_messages values. These metrics cover the dedicated VS Code Agents window only. The Copilot usage metrics policy must be enabled.

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