The way `pulumi new` installs dependencies for .NET projects is slightly different from other languages. For Node.js, Python, and Go, `pulumi new` runs the appropriate command to install project dependencies (e.g. `npm install`, `pip install`, or `go mod download`). For .NET, it calls the same routine used during `preview|up` to ensure required plugins are installed. For .NET, this ends up running `dotnet build` which implicitly installs Nuget packages, builds the project, and also attempts to determine and install the needed Pulumi plugins. When this operation runs during `preview|up`, and there are failures installing a plugin, the error is logged, but deliberately not returned, because an error will be shown for missing plugins later on during the `preview|up` operation. However, during `pulumi new`, we should show any plugin install errors.
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