JetDiagnosticsTest migrated to TestGenerator

- test data files renamed from *.jet to *.kt

compiler/testData/diagnostics/tests/subtyping/kt2069.kt

@@ -0,0 +1,14 @@
+//KT-2069 Cannot call super method when superclass has type parameters
+package kt2069
+
+trait T1 {
+    fun foo() {}
+}
+
+class T : T1 {
+    fun bar() {
+        super<T1>.foo()
+    }
+
+    class object {}
+}