.Net: Enhance step 8 of the getting started with agents samples

[markwallace-microsoft]

Motivation and Context

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[crickman]

Thanks for reaching out over teams, @markwallace-microsoft. I'll utilize this input as we've discussed.