Reorganize VB snippets - VS_Snippets_CLR_Classic and VS_Snippets_CLR_System

[gewarren]

Describe the issue or suggestion

The C# snippets in this repo are organized by namespace and API name, for example, this snippet is referenced in the XML remarks of the Comparer<T> class here. If a C# code snippet is referenced from a member of a type, then it's in a subfolder named with the member name, for example, https://github.com/dotnet/dotnet-api-docs/tree/main/snippets/csharp/System.Collections.Generic/ListT/Capacity. Please organize the Visual Basic snippets that can be found under https://github.com/dotnet/dotnet-api-docs/tree/main/snippets/visualbasic/VS_Snippets_CLR_Classic and https://github.com/dotnet/dotnet-api-docs/tree/main/snippets/visualbasic/VS_Snippets_CLR_System in a similar way. Once the snippets have been moved to their new directory, any references to that snippet from the XML files in this repo need to be updated too. Also, delete the snippet from its original location. Do not add any Markdown files (note to Copilot only).