JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/scopes/kt2262.kt

@@ -0,0 +1,16 @@
+package kt2262
+
+//KT-2262 Cannot access protected member from inner class of subclass
+
+abstract class Foo {
+    protected val color: String = "red"
+}
+
+class Bar : Foo() {
+    protected val i: Int = 1
+
+    class Baz {
+        val copy = color // INVISIBLE_MEMBER: Cannot access 'color' in 'Bar'
+        val j = i
+    }
+}