Object detection: Should pop-up error message when choosing Vott format file for "Coco".

**System Information (please complete the following information):**
Windows OS: Windows-11-Enterprise-22H2
ML.Net Model Builder 2022: 17.16.0.2332001 (Main Build)
Microsoft Visual Studio Enterprise: 2022(17.5.5)
.Net: 6.0, 7.0

**Describe the bug**
- On which step of the process did you run into an issue:
Should pop-up error message when choosing Vott format file for "Coco".

**TestMatrix**

**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 "Object detection" scenario.
5. On Data page, select "Coco".
6. Browse to a Vott data format file, you will see that there is no error message pop-up.

**Expected behavior**
Should pop-up error message when choosing Vott format file for "Coco".

**Screenshot**

**Additional context**