[Investigation] Support building dotnet-core application from .sln file about dotnet-publish HOT 3 OPEN

Perhaps it'd be sufficient here for the buildpack to look recursively at app subdirectories to find *.csproj files during detection phase. During the build phase, the buildpack could run dotnet publish from the app root (which will build all projects in a solution). Would that address your need, @prerak-patel ?

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Before potentially implementing, this needs exploration:

• Which buildpack(s) would require changes to make this possible?
• How would this impact runtime and/or SDK version selection?
• How would this impact SBOM generation?
• How would this interact with $BP_DOTNET_PROJECT_PATH?
  cc @paketo-buildpacks/dotnet-core-maintainers

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The other day, @macsux mentioned that it can be ambiguous which project(s) within a solution should be built. He mentioned the example of a frontend and backend checked in together under one solution, where the user may not want to build both into one container. This gives me the impression that it might not actually be wise for the buildpack to build the solution without BP_DOTNET_PROJECT_PATH set. @macsux perhaps you could comment here about this?

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