[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/inheritance/InheritanceAmbiguity4.kt

@@ -0,0 +1,47 @@
+// FILE: a/x.java
+package a;
+
+public class x {
+    class O {}
+}
+
+// FILE: a/x1.java
+package a;
+
+public class x1 extends x {}
+
+// FILE: a/x2.java
+package a;
+
+public class x2 extends x1 {}
+
+// FILE: a/i.java
+package a;
+
+public interface i {
+    public class O {}
+}
+
+// FILE: a/i2.java
+package a;
+
+public interface i2 extends i {
+    public class O {}
+}
+
+// FILE: a/i3.java
+package a;
+
+public interface i3 extends i2 {}
+
+// FILE: a/test.java
+package a;
+
+public class test extends x2 implements i3 {
+    public O getO() { return null; }
+}
+
+// FILE: test.kt
+package a
+
+fun test1() = test().<!MISSING_DEPENDENCY_CLASS!>getO<!>()