JS: prohibit is checks against native interfaces. Warn about casts to native interfaces. Fix #KT-14037, fix #KT-14038

compiler/testData/diagnostics/testsWithJsStdLib/native/rtti/whenIsNativeInterface.kt

@@ -0,0 +1,9 @@
+@native interface I
+
+@native interface J
+
+fun box(a: Any) = when (a) {
+    <!CANNOT_CHECK_FOR_NATIVE_INTERFACE!>is I<!> -> 0
+    <!CANNOT_CHECK_FOR_NATIVE_INTERFACE!>!is J<!> -> 1
+    else -> 2
+}