Fix addition of wrong java.lang imports on optimize imports

Add check to star importer, to not import already imported fqNames
 #KT-15273 fixed

idea/testData/editor/optimizeImports/jvm/allUnderImports/ClassNameConflictWithinDefaultImports.kt

@@ -0,0 +1,11 @@
+// NAME_COUNT_TO_USE_STAR_IMPORT: 1
+// RUNTIME_WITH_FULL_JDK
+import java.lang.Character.*
+
+/**
+ * [String]
+ */
+fun String.some() {
+    System.out
+    UPPERCASE_LETTER
+}

idea/testData/editor/optimizeImports/jvm/allUnderImports/ClassNameConflictWithinDefaultImports.kt.after

@@ -0,0 +1,11 @@
+// NAME_COUNT_TO_USE_STAR_IMPORT: 1
+// RUNTIME_WITH_FULL_JDK
+import java.lang.Character.UPPERCASE_LETTER
+
+/**
+ * [String]
+ */
+fun String.some() {
+    System.out
+    UPPERCASE_LETTER
+}