JS: prohibit inheritance of external classes from non-external (see KT-15130)

compiler/testData/diagnostics/testsWithJsStdLib/native/inheritance.kt

@@ -0,0 +1,23 @@
+// !DIAGNOSTICS: -DEPRECATION
+
+open class A
+
+interface I
+
+external open class B
+
+external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>C<!> : A()
+
+external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>D<!> : B(), I
+
+@native class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>N<!> : A()
+
+external interface <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>K<!> : I
+
+external enum class E {
+    X
+}
+
+external enum class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>F<!> : I {
+    X
+}