Test: Show historical sessions in Agent Debug Panel

[vijayupadya]

Refs: #309261

• anyOS @anthonykim1

Complexity: 3

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Agent Debug Log

To open the Agent Debug Logs panel:

• Enable the following setting:

   `github.copilot.chat.agentDebugLog.FileLogging.enabled`
  

• Create a chat session and send few messages in chat

• Select the ellipsis (...) menu in the Chat view and select Show Agent Debug Logs.

• Navigate to home page by clicking on the 'Agent Debug Logs' root item in the navigation link

• You should see old sessions listed upto 5 items with 'Show more' button
• Click on 'Show more', ensure it loads 5 more (display capped at 15 items currently)
• Select any of the old sessions
• Click "View Logs" → log list shows events with timestamps, names, details.
• Click "Agent Flow Chart" → flowchart renders with nodes for model turns, tool calls, subagents
• Send a message and verify events appear — verify new events, model turn, tool calls etc appear
• Navigate back to Debug panel home page
• Start a new chat session and send few messages in chat
• Check the new session title appears in the Debug panel, navigate to it and check events show up in logs view