Remove .NET 6/7 zone pivots

[gewarren]

Contributes to #43161

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docs/core/tutorials/cli-templates-create-template-package.md	Tutorial: Create a template package
docs/core/tutorials/debugging-with-visual-studio-code.md	Debug a .NET console application using Visual Studio Code
docs/core/tutorials/debugging-with-visual-studio.md	Tutorial: Debug a .NET console application using Visual Studio
docs/core/tutorials/library-with-visual-studio-code.md	docs/core/tutorials/library-with-visual-studio-code
docs/core/tutorials/library-with-visual-studio.md	Tutorial: Create a .NET class library using Visual Studio
docs/core/tutorials/publishing-with-visual-studio-code.md	Publish a .NET console application using Visual Studio Code
docs/core/tutorials/publishing-with-visual-studio.md	Tutorial: Publish a .NET console application using Visual Studio
docs/core/tutorials/testing-library-with-visual-studio-code.md	docs/core/tutorials/testing-library-with-visual-studio-code
docs/core/tutorials/testing-library-with-visual-studio.md	Tutorial: Test a .NET class library with .NET using Visual Studio
docs/core/tutorials/with-visual-studio-code.md	Create a .NET console application using Visual Studio Code
docs/core/tutorials/with-visual-studio.md	Tutorial: Create a .NET console application using Visual Studio
docs/standard/serialization/system-text-json/migrate-from-newtonsoft.md	Migrate from Newtonsoft.Json to System.Text.Json
docs/zone-pivot-groups.yml	docs/zone-pivot-groups

[gewarren]

Ping @tdykstra

[BillWagner]

This LGTM. Let's