Extraction Engine: Forbid extraction of non-singleton qualifiers

#KT-8297 Fixed

idea/testData/refactoring/extractFunction/basic/classQualifier.kt

@@ -0,0 +1,11 @@
+class A {
+    companion object {
+        fun foo() {
+
+        }
+    }
+}
+
+fun bar() {
+    <selection>A</selection>.foo()
+}