Optimize Imports tests: Switch to generated approach

Move test and rename test data
Delete unused testdata
Rewrite OptimizeImportOnFlyTest

idea/testData/editor/optimizeImports/RemoveImportsIfGeneral/RemoveImportsIfGeneral.after.kt

@@ -0,0 +1,7 @@
+import java.util.*
+
+class Action {
+    fun test(hash: HashSet<Int>) {
+        val test : ArrayList<Int>? = null
+    }
+}

idea/testData/editor/optimizeImports/RemoveImportsIfGeneral/RemoveImportsIfGeneral.kt

@@ -0,0 +1,9 @@
+import java.util.HashSet
+import java.util.ArrayList
+import java.util.*
+
+class Action {
+    fun test(hash: HashSet<Int>) {
+        val test : ArrayList<Int>? = null
+    }
+}