KT-13047 Autocomplete inserts a fully-qualified variable name inside a String

KT-12083 String interpolation -- auto {} if there is a letter after cursor

 #KT-13047 Fixed
 #KT-12083 Fixed

idea/idea-completion/testData/handlers/basic/stringTemplate/ValInObject.kt

@@ -0,0 +1,14 @@
+package p
+
+object OOO {
+    val vvv = 1
+}
+
+class C {
+    fun foo() {
+        "$v<caret>"
+    }
+}
+
+// ELEMENT: vvv
+// INVOCATION_COUNT: 2