feat(DATAGO-123192): Add feature to delete all chat history at once

[amir-ghasemi]

This pull request introduces new bulk session management features to both the backend and frontend, allowing users to efficiently delete multiple chat sessions at once or within a specific date range. It also adds a new session statistics endpoint and integrates these capabilities into the web UI's settings dialog, providing users with more control over their session data.

Backend: Bulk Session Management & Statistics

• Added API endpoints for bulk session deletion and session statistics, including request/response models and error handling in sessions.py.
• Introduced date handling for session operations by importing datetime and timedelta in session_service.py.

Frontend: API Integration

• Created bulkDeleteSessions and deleteAllSessions functions, along with supporting types, in sessions.ts for communicating with the new backend endpoints.
• Exported the new session API functions from the main API index for use throughout the app.

Frontend: UI Enhancements

• Added a new SessionManagementSettings React component that allows users to delete all sessions or sessions within a date range, with confirmation dialogs and notifications.
• Integrated the session management section into the settings dialog, including a sidebar item that appears when persistence is enabled, and ensured correct routing and display of the new settings panel. [1] [2] [3] [4] [5]
• Exported the new settings component for use elsewhere in the app.

[github-actions]

WhiteSource Policy Violation Summary

✅︎ No Blocking Whitesource Policy Violations found in solaceai/solace-agent-mesh-ui-pr-901!

[sonarqube-solacecloud]

Quality Gate failed

Failed conditions
24.8% Coverage on New Code (required ≥ 70%)
C Reliability Rating on New Code (required ≥ A)

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