add test for passing params as structural params #3995
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At least in my context, it is very typical to define models based on subcomponents. However, the parameters still "belong" to the higher level model not to the lower level model. See #2714
A solution which works for me is to pass symbolic parameters of the outer system as structural parameters to the inner system. That works great, but might be off the beaten track and feels like the kind of feature which easily breaks by accident. This PR just adds a test case for that to detect accidental breakage before it breaks my whole model library 🙃