[WebToolsE2E] Using VS Code C# Dev Kit, there is no IntelliSense for JSON editing when configuring Aspire integrations

[v-yuannie]

REGRESSION INFO: Not a regression

INSTALL STEPS

1. Clean machine: Win11 x64 ENU
2. Install SDK 9.0.201 (latest-released-version)
3. Install Aspire templates 9.1 (latest-released-version)
   • dotnet new install Aspire.ProjectTemplates
4. Install VS Code + C# Dev Kit extension (latest pre-release version 1.17.48)

REPRO STEPS

1. Using VS Code, create new 9.0 .NET Aspire Starter App > AspireApp1
2. In Solution Explorer, right-click AspireApp1.Web project > Add NuGet Package > Aspire.Azure.Storage.Blobs > add a component
3. Open appsettings.json > make changes related to Aspire component

ACTUAL
There is no intellisense for Aspire-related changes

EXPECTED
Similar to what VS does, it will get intellisense for Aspire-related changes