NI: approximate not top-level captured types during code generation

^KT-40693 Fixed

compiler/testData/codegen/box/inference/approximateNonTopLevelCapturedTypes.kt

@@ -0,0 +1,13 @@
+interface BasePublisher<U>
+
+interface Flow<out P>
+
+fun <R> asFlow(x: BasePublisher<R>): Flow<R> = null as Flow<R>
+
+class Document<S>
+
+interface DerivedPublisher<K>: BasePublisher<Document<K>> {}
+
+class Foo<T>(val x: DerivedPublisher<out T>) : Flow<Document<out T>> by asFlow(x)
+
+fun box() = "OK"