System Information (please complete the following information):

• OS & Version: [e.g. Windows 10]
• ML.NET Version: [e.g. ML.NET v1.5.5]
• .NET Version: [e.g. .NET 5.0]

Describe the bug
It seems that Text-classification cancellation does not cooperate with mlContext cancellation.
To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots, Code, Sample Projects
If applicable, add screenshots, code snippets, or sample projects to help explain your problem.

Additional context
Add any other context about the problem here.