.Net: Some follow up code review feedback for https://github.com/microsoft/semantic-kernel/pull/12226

[markwallace-microsoft]

https://github.com/microsoft/semantic-kernel/pull/12226/files#r2102767879
https://github.com/microsoft/semantic-kernel/pull/12226/files#r2102780822
https://github.com/microsoft/semantic-kernel/pull/12226/files#r2102782836