[NI] Report unsafe implicit invoke accordingly to OI

There are several issues with unsafe desugaring for convention calls.
Proper fix is not implemented here (see design proposal KT-30872).
This commit only applies the old logic in the new inference.
^KT-30695 Fixed

compiler/testData/diagnostics/tests/generics/nullability/functionalBound.kt

@@ -1,7 +1,6 @@
-// !WITH_NEW_INFERENCE
 fun <E : String?, T : ((CharSequence) -> Unit)?> foo(x: E, y: T) {
     if (x != null) {
-        <!NI;UNSAFE_CALL, OI;UNSAFE_IMPLICIT_INVOKE_CALL!>y<!>(<!DEBUG_INFO_SMARTCAST!>x<!>)
+        <!UNSAFE_IMPLICIT_INVOKE_CALL!>y<!>(<!DEBUG_INFO_SMARTCAST!>x<!>)
     }
 
     if (y != null) {