[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/resolve/invoke/invokeAndSmartCast.kt

@@ -1,4 +1,3 @@
-// !WITH_NEW_INFERENCE
 class A(val x: (String.() -> Unit)?)
 
 fun test(a: A) {