.NET: Harness code act skill sample (#5930)

* Add sample that shows code execution and skills together

* Use nuget for python module path

* Update readme.

* Fix formatting.

* Reduce flashing in rendering.

* Improve screen clearing for Powershell

* Add a couple of small UX fixes

dotnet/samples/02-agents/Harness/ConsoleReactiveComponents/AnsiEscapes.cs

@@ -24,6 +24,11 @@ public static class AnsiEscapes
     /// </summary>
     public static string MoveCursor(int row, int column) => $"\x1b[{row};{column}H";
 
+    /// <summary>
+    /// Erases the current line from the cursor position to the end of the line (EL 0).
+    /// </summary>
+    public static string EraseToEndOfLine => "\x1b[0K";
+
     /// <summary>
     /// Erases the entire current line (EL 2).
     /// </summary>