Python: .Net: New Feature: Improve final output handling when max_round_count is reached in MagenticOrchestration

[vamsithumma2812]

📌 Problem Statement

Currently, when using MagenticOrchestration in Semantic Kernel (Python/.NET) with multiple agents and a max_round_count limit, the framework simply returns the last agent's message as the final output when the round limit is reached. This differs from AutoGen's Magentic One implementation, which includes a final response from the orchestrator that synthesizes the conversation to solve the given task.

🎯 Proposed Feature

Enhance MagenticOrchestration to provide intelligent final output handling when max_round_count is reached by implementing the following:

Automatic Final Response Synthesis: When max_round_count is reached, the orchestrator should:

• Analyze all available context and agent outputs from the conversation
• Synthesize the information into a coherent final response that addresses the user's original task
• Provide a conclusive answer rather than just returning the last agent's intermediate output

[moonbox3]

@vamsithumma2812, in Python, we've already handled this as part of #12656. Will leave open to track for .NET.

As a note, I'm not sure we'd need to "synthesize" the info into a "coherent final responses that addresses the user's original task." We hit the max_round_count, which assumes the final result may not be available. All other results are available from the callback, and based on the PR I linked, we now return the last generated result, instead of simply returning "Max round count reached."