buildDotnetModule: fix cross-compilation and remove dotnet-test-sdk

This change fixes cross-compilation for .NET packages (that are not
using .sln as project files). See relevant comment in the change list
for more details.

In addition to that, it removes dotnet-test-sdk that appears to be
broken, that is, dotnet --list-sdks does not recognize SDKs from PATH,
and when propagated from the check hook it was shadowed by inputs from
preceding hooks.

Note that dotnet-test-sdk used to work when it was introduced in PR
144062, but PR 155257 probably overlooked this case. However, currently
it is not used in Nixpkgs and I think dotnetCorePackages.combinePackages
should cover the intended use case for dotnet-test-sdk.

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