Optimize Imports tests: Switch to generated approach

Move test and rename test data
Delete unused testdata
Rewrite OptimizeImportOnFlyTest

idea/testData/editor/optimizeImports/AlreadyOptimized/AlreadyOptimized.kt

@@ -0,0 +1,20 @@
+/**
+Comment 1
+*/
+package sometest
+
+import java.io as JavaIO
+import java.text.Annotation as TextAnnotation
+import java.util.ArrayList
+import java.util.HashSet
+
+/**
+Comment 2
+*/
+class Action {
+    fun test(hash : HashSet<Int>) {
+        val some : TextAnnotation? = null
+        val test : ArrayList<Int>? = null
+        JavaIO.File(StringBuilder().append("Hello").toString())
+    }
+}