K2: Do not use KFunctionN as representation type for adapted references

Beside some corner cases, it's already prohibited in K1 because
adaptation have a bit strange nature
(they don't represent any existing real function exactly)

^KT-55137 Fixed

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

@@ -22,6 +22,6 @@ object Local {
     fun baz(x: Int, y: Int = 0): Int = 0
 
     fun test() {
-        bar(::baz)
+        <!INAPPLICABLE_CANDIDATE!>bar<!>(::<!UNRESOLVED_REFERENCE!>baz<!>)
     }
 }

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

@@ -22,6 +22,6 @@ object Local {
     fun baz(x: Int, y: Int = 0): Int = 0
 
     fun test() {
-        bar(::baz)
+        <!INAPPLICABLE_CANDIDATE!>bar<!>(::<!UNRESOLVED_REFERENCE!>baz<!>)
     }
 }