Remove defunct UseTestingPlatformProtocol reference for vscode

[erwinkramer]

Description

dotnet.testWindow.useTestingPlatformProtocol seems to be a defunct setting in vscode now. No need to include it anymore.

There are more references to testing platform protocol, but I'm not sure if that's related: https://github.com/search?q=repo%3Athomhurst%2FTUnit%20useTestingPlatformProtocol&type=code

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Performance improvement
• Refactoring (no functional changes)

Checklist

Required

• I have read the Contributing Guidelines
• If this is a new feature, I started a discussion first and received agreement
• My code follows the project's code style (modern C# syntax, proper naming conventions)
• I have written tests that prove my fix is effective or my feature works

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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[thomhurst]

Thanks!