[TEST] Migrate duplicating javac tests to new test runners

Also minimize scope of DiagnosticUsingJavac tests to
 `compiler/testData/diagnostics/tests/javac`. This is fine since
 javac compilation mode is still not finished and no one not going to
 support it

compiler/testData/diagnostics/tests/javac/inners/ComplexCase.kt

@@ -0,0 +1,39 @@
+// FIR_IDENTICAL
+// FILE: p1/I.java
+package p1;
+
+public interface I {}
+
+// FILE: p2/I.java
+package p2;
+
+public class I {}
+
+// FILE: p/X.java
+package p;
+
+import p1.*;
+import p2.I;
+
+public class X {
+
+    public class I1<I> {
+        public I getI() { return null; }
+    }
+
+    public static class N {
+        public I getI() { return null; }
+
+        public class I<I> {
+            public I getI() { return null; }
+        }
+
+    }
+
+    public class I {
+        public I getI() { return null; }
+    }
+
+    public I getI() { return null; }
+
+}