Fix handling recursion over fields (#88083)

Fix handling recursion over fields (#88083)

See the test for an example. C++ would probably tell the user to take a hike for a template like this, but we need to support this in .NET.

* Use the same logic to root types of reflectable fields as we do for methods instead of asking for a concrete type
* Fix another issue in debug info emission. We already had logic to cut off deep generics, but deep arrays weren't considered. Also consider array depth.