.NET 8.4.1 - ServiceDefault and OpenTelemetry

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

I would like to include a .NET 8.4.1 framework console project that makes use of the Microsoft.Extensions.Hosting and other packages to run a background service into an aspire solution; at present the .NET 8.4.1 framework loads and runs as expected; however the I'm unable to make use of the ServiceDefaults project and/or setup the OpenTelemetry the following error is shown:

System.NotSupportedException: 'OtlpExportProtocol.Grpc with the default HTTP client factory is not supported on .NET Framework or .NET Standard 2.0.Please switch to OtlpExportProtocol.HttpProtobuf or provide a custom HttpClientFactory.'

### Describe the solution you'd like

add suppport for .NET 4.x projects and/or update the ServiceDefaults template so it may be used by .NET 4.x framework projects.

### Additional context

_No response_

Start by reproducing the error in the .NET Framework console project that uses Microsoft.Extensions.Hosting, the ServiceDefaults project, and OpenTelemetry. Read the ServiceDefaults project and template configuration to determine how the default OTLP protocol is selected. Done means a .NET 4.x framework project can use ServiceDefaults and OpenTelemetry, or the template clearly supports the compatible protocol or custom HTTP client factory.

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