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/adapted/noKFunctionForAdaptation.kt

@@ -0,0 +1,16 @@
+// SKIP_TXT
+fun foo(x: String = "O"): String = x
+fun bar(x: String = "K"): String = x
+
+fun dump(dumpStrategy: String) {
+    val k0: kotlin.reflect.KFunction0<String> = returnAdapter(<!ADAPTED_CALLABLE_REFERENCE_AGAINST_REFLECTION_TYPE!>::foo<!>) // Error: ADAPTED_CALLABLE_REFERENCE_AGAINST_REFLECTION_TYPE
+    val k1: kotlin.reflect.KFunction0<String> = <!TYPE_MISMATCH!>::<!TYPE_MISMATCH!>foo<!><!>
+    // Should be error here, too
+    val k2: kotlin.reflect.KFunction0<String> = if (dumpStrategy == "KotlinLike") ::foo else ::bar
+
+    val f0: Function0<String> = returnAdapter(<!ADAPTED_CALLABLE_REFERENCE_AGAINST_REFLECTION_TYPE!>::foo<!>)
+    val f1: Function0<String> = <!TYPE_MISMATCH!>::<!TYPE_MISMATCH!>foo<!><!>
+    val f2: Function0<String> = if (dumpStrategy == "KotlinLike") ::foo else ::bar
+}
+
+fun returnAdapter(a: kotlin.reflect.KFunction0<String>) = a