[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/InheritanceWithKotlinClasses.kt

@@ -0,0 +1,31 @@
+// FIR_IDENTICAL
+// FILE: a/k.kt
+package a
+
+open class k {
+    fun getK(): k? = null
+    fun getI(): i? = null
+    inner class i
+}
+
+// FILE: a/y.java
+package a;
+
+public class y {
+    public k getK() { return null; }
+}
+
+// FILE: a/x.java
+package a;
+
+public class x extends k {
+    public i getIFromJava() { return null; }
+}
+
+// FILE: test.kt
+package a
+
+fun test() = x().getK()
+fun test2() = x().getI()
+fun test3() = x().getIFromJava()
+fun test4() = y().getK()