[FIR] Make captureFromTypeParameterUpperBoundIfNeeded smarter

Before this change `ARGUMENT_TYPE_MISMATCH` would complain that
`Y` "is not a subtype of" `Inv<Y>`, because the function would only
check immediate bounds of the type parameter `Y`. `chosenSupertype`
would be `X`, not `Inv<out kotlin/String>`.

^KT-60056

compiler/testData/diagnostics/tests/inference/capturedTypes/captureFromTypeParameterUpperBound.fir.kt

@@ -1,11 +0,0 @@
-interface Inv<T>
-
-fun <Y: X, X : Inv<out String>> foo(x: X, y: Y) {
-    val rX = bar(x)
-    rX.length
-
-    val rY = bar(<!ARGUMENT_TYPE_MISMATCH!>y<!>)
-    rY.<!UNRESOLVED_REFERENCE!>length<!>
-}
-
-fun <Y> bar(l: Inv<Y>): Y = TODO()

compiler/testData/diagnostics/tests/inference/capturedTypes/captureFromTypeParameterUpperBound.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 interface Inv<T>
 
 fun <Y: X, X : Inv<out String>> foo(x: X, y: Y) {