KT-1151 Code completion for not imported extension functions - test for completion extension function without params

idea/testData/completion/basic/multifile/NotImportedExtensionFunction-1.kt

@@ -0,0 +1,10 @@
+package first
+
+fun firstFun() {
+    val a = ""
+    a.hello<caret>
+}
+
+// EXIST: helloFun
+// EXIST: helloFunPreventAutoInsert
+// NUMBER: 2

idea/testData/completion/basic/multifile/NotImportedExtensionFunction-2.kt

@@ -0,0 +1,7 @@
+package second
+
+fun String.helloFun() {
+}
+
+fun String.helloFunPreventAutoInsert() {
+}