All scenarios: The file path textbox and drop-down list are empty after choosing the data source when the mbconfig file is re-opening.

**System Information (please complete the following information):**
Windows OS: Windows-11-Enterprise-22H2
ML.Net Model Builder 2022: 17.18.2.2412201 (Main Build)
Microsoft Visual Studio Enterprise: 2022(17.8.5)
.Net Core: 6.0,7.0,8.0

**Describe the bug**
- On which step of the process did you run into an issue:
The file path textbox and drop-down list are empty after choosing the data source when the mbconfig file is re-opening.

**TestMatrix**
https://testpass.blob.core.windows.net/test-pass-data/wikipedia-detox-250-line-data.tsv

**To Reproduce**
Steps to reproduce the behavior:

1. Select Create a new project from the Visual Studio start window.
2. Choose the C# Console App (.NET Core) project template.
3. Add model builder by right click on the project.
4. Select any scenario.
5. Go to Data page, then close and save the mbconfig file.
6. Re-open the mbconfig file, go to Data page again, choose the data source.
7. You will see that the file path textbox and drop-down list are empty after choosing the data source when the mbconfig file is re-opening.

**Expected behavior**
The file path textbox and drop-down list should be displayed well after choosing the data source when the mbconfig file is re-opening.

**Screenshot:**

**Additional context:**

Riprodurre il problema in Visual Studio usando una C# Console App e un file mbconfig: aprire la Data page, salvarla e chiuderla, riaprirla e selezionare nuovamente l'origine dati. Esaminare il comportamento della Data page e verificare che la casella di testo del percorso del file e l'elenco a discesa visualizzino i relativi valori dopo la riapertura.

Scritto dal modello di indicizzazione a partire dal testo della issue.