feat: onboard new sample data analyst agent v2

[qfai]

Add Data Analyst Agent v2 Sample

Summary

This PR adds the data-analyst-agent-v2 sample to the samples gallery and includes necessary fixes for the sample to work correctly.

Validation result

Changes

New Sample: data-analyst-agent-v2

• AI-powered data analyst agent built with Microsoft 365 Agents Toolkit
• Uses Azure OpenAI for intelligent data analysis capabilities
• Includes evaluation framework for testing agent responses

Code Changes

• prompt.ts: Changed from subagent pattern (.use()) to direct function calling (.function()) for better compatibility with Azure OpenAI models
• cards.ts: Updated adaptive card implementations
• package.json & tsup.config.js: Build configuration updates

Asset Fixes

• demo.gif: Resized to correct 40:23 aspect ratio (800×460) for gallery display

Configuration

• Added data-analyst-agent-v2 entry to .config/samples-config-v3.json

Known Issues

Documented in README: Service Principal Creation Failure During Local Debug (Admin Accounts Only)

When running local debug with an M365 admin account, you may encounter the error:

The client application <client-id> is missing service principal in the tenant <tenant-id>.

This is a known issue with Teams Developer Portal. The workaround is to use a non-admin M365 account for local debugging. This does not affect debugging in Microsoft 365 Agents Playground or remote deployment to Azure.

Testing

• ✅ Local validation passed(debug in playground/edge/remote)
• ✅ Sample validation passed (convert demo.gif to correct aspect ratio)