.NET: Fix JailbreakSyncExecutor and FinalOutputExecutor to use List<C…

[rezaghadimim]

Motivation and Context

This change is required because previously JailbreakSyncExecutor and FinalOutputExecutor only accepted a single ChatMessage. That limitation caused the sample workflow described in issue #2696 to break — after the AI agent step, subsequent executors were skipped. With this update, those executors now accept List (one of the officially supported input types), which restores correct workflow chaining and prevents silent failures.

Description

• Updated input type for JailbreakSyncExecutor and FinalOutputExecutor from ChatMessage to List.

• Adjusted sample usage and test cases to pass lists instead of single messages.

• No other functional changes were made to executor logic.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[Copilot]

Pull request overview

This PR fixes a critical workflow chaining issue in the 07_MixedWorkflowAgentsAndExecutors sample by updating JailbreakSyncExecutor and FinalOutputExecutor to accept List<ChatMessage> instead of single ChatMessage objects. This change enables proper workflow continuation after AI agent steps, preventing executors from being silently skipped.

Key Changes:

• Changed input type from ChatMessage to List<ChatMessage> for both executors
• Updated message extraction logic to use LastOrDefault() to retrieve the last assistant message from the list
• Maintained existing executor behavior while supporting the correct workflow message passing pattern

[rezaghadimim]

@microsoft-github-policy-service agree

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[markwallace-microsoft]

Naming the parameter messages would be better as it is not a list

[markwallace-microsoft]

Same comment as above

[markwallace-microsoft]

Rather than string.Empty should this be UNKNOWN?

[markwallace-microsoft]

Same comment as above?

[markwallace-microsoft]

There is another PR with a similar fix for this issue: #2182