[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/sealed/DerivedTopLevel.fir.kt

@@ -0,0 +1,10 @@
+sealed class Base
+
+class Derived: Base() {
+    class Derived2: Base()
+}
+
+fun test() {
+    class Local: Base()
+}
+