[mono] Fix output directory for cross compilers if OutputRID is overridden #109932
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This happens e.g. in the VMR where OutputRID is set globally. We assumed in monoaotcross.proj that the inner mono cross compiler runtime build would put files into a path that matches the target RID but we were using OutputRID in the inner build.
Instead use the preexisting MonoAotCrossDir property.
Also fix marking DotNetBuildMonoCrossAOT=true as a ShortStack build.