FIR: Add workaround for OverloadResolutionByLambdaReturnType

Mostly, that should help for existing flatMap usages

^KT-43129 Submitted

compiler/testData/diagnostics/tests/callableReference/resolve/resolveTwoReferencesAgainstGenerics.fir.kt

@@ -1,10 +0,0 @@
-// !LANGUAGE: +NewInference
-// !DIAGNOSTICS: -UNUSED_PARAMETER
-// WITH_RUNTIME
-
-
-fun <T> List<Option<T>>.flatten(): List<T> = <!AMBIGUITY!>flatMap<!> { <!UNRESOLVED_REFERENCE!>it<!>.<!NONE_APPLICABLE!>fold<!>(::emptyList, <!UNRESOLVED_REFERENCE!>::listOf<!>) }
-
-class Option<out T> {
-    fun <R> fold(ifEmpty: () -> R, ifSome: (T) -> R): R = TODO()
-}

compiler/testData/diagnostics/tests/callableReference/resolve/resolveTwoReferencesAgainstGenerics.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !LANGUAGE: +NewInference
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 // WITH_RUNTIME