Fix scenario where source generator isn't detecting parameters passed to WinRT mapped interfaces #1867
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Previously we had scoped our lookup table generation checks to WinRT classes to avoid generating for custom mapped classes that aren't actually WinRT classes such as string. But that meant we didn't generate for custom mapped WinRT interfaces such as IDictionary which we should still detect. This addresses that by fixing the check to also look at custom mapped interfaces.
Fixes #1797