Default to .NET 8 for inproc

[liliankasem]

Issue describing the changes in this PR

resolves #4215

Pull request checklist

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[jviau]

For the end to end experience, net8 in-proc apps need an extra app setting when deployed to Azure. Is that end to end experience covered here? Or will customer's need to just know that add that setting themselves?

[liliankasem]

For the end to end experience, net8 in-proc apps need an extra app setting when deployed to Azure. Is that end to end experience covered here? Or will customer's need to just know that add that setting themselves?

I'm not actually sure about the Azure experience, but FUNCTIONS_INPROC_NET8_ENABLED is only required for Core Tools IIRC (and that is set automatically via the .NET 8 template) - or are you referring to a different setting?

[jviau]

I think FUNCTIONS_INPROC_NET8_ENABLED is needed in Azure also, so that we deploy you to a net8 host and not a net6 host (as their site extensions are different). But if the template adds that setting it sounds good to me

[satvu]

Templates suggest it: https://github.com/Azure/azure-functions-templates/blob/dev/Functions.Templates/ProjectTemplate_v4.x/CSharp/local.settings.json (inside local.settings.json) and it's documented here. I think it would be good to test deploying and making sure the proper host is used in Azure.