.Net: fix: add "status" field to Python dynamic session response (microsoft#9903)

### Motivation and Context

Addresses issue microsoft#9902 for .NET.

Include the "status" field in the response string returned by Python
dynamic sessions. Fixes a usability issue where the LLM assumes success
despite execution failures.


### Description

As per microsoft#9902, including the `status` property from the response in the
plugin result, we ensure that the LLM has explicit information about
whether the execution succeeded or failed, preventing misinterpretation
of stderr or other response elements.

This helps avoid hallucinated follow-ups or unnecessary retries by
providing clear success/failure indicators.


### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

---------

Co-authored-by: Evan Mattson <[email protected]>

Author: malandis

dotnet/src/Plugins/Plugins.Core/CodeInterpreter/SessionsPythonPlugin.cs

@@ -113,6 +113,8 @@ public async Task<string> ExecuteCodeAsync([Description("The valid Python code t
         var jsonElementResult = JsonSerializer.Deserialize<JsonElement>(await response.Content.ReadAsStringAsync().ConfigureAwait(false));
 
         return $"""
+            Status:
+            {jsonElementResult.GetProperty("status").GetRawText()}
             Result:
             {jsonElementResult.GetProperty("result").GetRawText()}
             Stdout:

dotnet/src/Plugins/Plugins.UnitTests/Core/SessionsPythonPluginTests.cs

@@ -70,6 +70,8 @@ public async Task ItShouldExecuteCodeAsync()
             Content = new StringContent(responseContent),
         };
         var expectedResult = """
+                       Status:
+                       "Success"
                        Result:
                        ""
                        Stdout: