Test: `Fix with Chat` action for task configuration errors

[meganrogge]

Refs #192811

• [ ] Windows
• [ ] macOS
• [ ] Linux

Complexity: 3

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Users have said that task configuration errors aren't helpful and it can be hard to know how to fix them. We've introduced a Fix with Chat action to improve the experience.

When you modify and save your tasks.json file with improper configuration, you'll be prompted with a notification that may include this action.

For example, you may see this if you have not provided the necessary properties for a problemMatcher. Please test out various scenarios and verify the chat request is rendered well and the response is reasonable.