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omnisharp-vscode
Discontinued Official C# support for Visual Studio Code [Moved to: https://github.com/dotnet/vscode-csharp]
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
In any case, you cannot opt-out of all scenarios according to section 3a of its license:
VS Codium is a fully open-source alternative to VS Code based on the same codebase. They try to remove all telemetry, read more about that here. They can't shut all the data collection though as it is the same codebase, and extensions act independently with regard to telemetry.
Microsoft have added GDPR annotations to telemetry events to describe their purpose. I guess that covers Article 15(1)(a) mentioned above. It is an enumerated variable, which can contain values: "FeatureInsight", "PerformanceAndHealth", "BusinessInsight", and "SecurityAndAuditing". It is kind of vague. What does a "BusinessInsight" event mean?