Agentic autofix generation for code scanning alerts [Public Preview]

### Value Prop

You can now assign code scanning alerts directly to copilot for automatic fixes, saving time and effort on security issues. This makes it easier to keep your code secure and up to date without manual intervention.

### Expected Outcome

We want to help you resolve code scanning alerts faster and with less work, so you can focus on building features instead of fixing vulnerabilities. By automating the fix process, we aim to improve your workflow efficiency and overall code security.