Don't run crossgen2 or ilc when cross-building in source-build #95088
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To make the runtime compatible with cross-arch compilation, we should add
--cross
to the source-build build, and avoid publishing ReadyToRun or AOT compiled. The compilers don't have a valid runtime pack for the host during the crossbuild at this point, so trying to run them fails.Part of dotnet/source-build#3698