Move callable reference diagnostic tests to non-stdlib

compiler/testData/diagnostics/tests/callableReference/function/unresolved.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_EXPRESSION
+class A
+
+fun main() {
+    val <!UNUSED_VARIABLE!>foo<!> = ::<!UNRESOLVED_REFERENCE!>foo<!>
+    
+    ::<!UNRESOLVED_REFERENCE!>bar<!>
+    
+    A::<!UNRESOLVED_REFERENCE!>bar<!>
+    
+    <!UNRESOLVED_REFERENCE!>B<!>::<!DEBUG_INFO_ELEMENT_WITH_ERROR_TYPE!>bar<!>
+}