Update VS Code settings to new C#DK Settings

[JakeRadMSFT]

Updates VS Code settings to support both legacy and current C# extension solution handling.

Adds dotnet.solution.autoOpen while keeping dotnet.defaultSolution for backward compatibility with stable VS Code versions.

This is needed because Aspire repo isn't compatible with WorkspaceBasedDevelopment yet ...

[github-actions[bot]]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 12950

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 12950"

[captainsafia]

This is needed because Aspire repo isn't compatible with WorkspaceBasedDevelopment yet

What does this mean?

[JakeRadMSFT]

This is needed because Aspire repo isn't compatible with WorkspaceBasedDevelopment yet

What does this mean?

It has multiple projects with the same name (I think test assets).