Refine member scope for types with projections

Instead of erasing descriptors with conflicting substitution,
use invariant CapturedType(<projection>) as replacement for type parameter
within default member scope.

After substitution leave such types 'as is' everywhere except return types,
use common approximation for them.

 #KT-9294 In Progress
 #KT-5411 Fixed
 #KT-8647 Fixed

 #KT-9462 Fixed
 #KT-9893 Fixed
 #KT-7581 Fixed
 #KT-7296 In Progress

compiler/testData/diagnostics/tests/generics/projectionsScope/starNullability.kt

@@ -0,0 +1,16 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// !CHECK_TYPE
+// See KT-9893
+open class A
+
+public interface I<T : A> {
+    public fun foo(): T?
+}
+
+fun acceptA(a: A) {
+}
+
+fun main(i: I<*>) {
+    i.foo() checkType { _<A?>() }
+    acceptA(<!TYPE_MISMATCH!>i.foo()<!>) // i.foo() should be nullable but isn't
+}