Delete C++/CLI snippets where not needed

[gewarren]

Describe the issue or suggestion

In the "old days", we always added API examples to the .NET docs in three languages: C#, VB, and C++/CLI. Today, we primarily add snippets in C#, sometimes also VB, and never in C++/CLI. We’ve also never had a customer request for a C++/CLI code example.

As far as maintenance goes, if one of these older code snippets needs to be updated, then it needs to be updated in 3 languages. Also, many of these code examples use now-obsolete APIs and/or outdated syntax. Given that C++/CLI has numerous restrictions on .NET (Core) (for example, it only runs on Windows) and doesn’t seem to be commonly used except as a thin interop layer, we propose deleting the C++/CLI snippets from the .NET docs except for in the following areas:

• Interop docs
• .NET Framework-specific docs

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Associated WorkItem - 423793