Support .NET 8 dockerless build

[weikanglim]

Currently, azd supports dockerless builds using Oryx buildpacks for languages. azd uses builder image mcr.microsoft.com/oryx/builder:debian-buster-20231004.1 for dotnet. This does not support .NET 8 yet.

Loosely, we have a few options:

Option 1 (buildpacks support):

Wait for mcr.microsoft.com/oryx/builder:debian-bookworm-20231004.1 to support all versions of .NET

Option 2 (buildpacks + azd support)

Implement .NET version detection logic, to be able to switch builder images

Option 3 (azd support + .NET container build)

Implement .NET version detection logic, for versions of .NET (maybe just 8.+) that support container support, use dotnet publish by default.

[spboyer]

If we go with Option 3, it would have to be for .NET 8+ only. In .NET 7, there is a nuget package required to support SDK Container builds. Need to consider local architecture target versus host target. Making sure there is a way to define PLATFORM for image. Cannot assume local=target host

[weikanglim]

We ended up on Option 1 with #3112

It will still be interesting to see how we want start slowly moving .NET8+ users onto .NET native publishing with #2632