Prep code/folders for .NET 9

[Rick-Anderson]

Description

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Page URL

https://learn.microsoft.com/en-us/aspnet/core/data/ef-rp/intro?view=aspnetcore-8.0&tabs=visual-studio

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/data/ef-rp/intro.md

Document ID

fa488196-1f98-08ea-adcc-17d9dac86727

Article author

@tdykstra

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Associated WorkItem - 335247