[JS IR] Add test on frontend check with enum exportness

^KT-49754 fixed

compiler/testData/diagnostics/testsWithJsStdLib/export/extendingNonExportedType.kt

@@ -24,3 +24,9 @@ interface ExportedGenericInterface<T>
 
 @JsExport
 class <!NON_EXPORTABLE_TYPE("super; ExportedGenericInterface<NonExportedClass>")!>ExportedClass4<!> : ExportedGenericInterface<NonExportedClass>
+
+@JsExport
+enum class <!NON_EXPORTABLE_TYPE("super; NonExportedInterface")!>ExportedEnum<!> : NonExportedInterface {
+    EXPORTED_ENUM_1,
+    EXPORTED_ENUM_2
+}

compiler/testData/diagnostics/testsWithJsStdLib/export/extendingNonExportedType.txt

@@ -30,6 +30,25 @@ package foo {
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
     }
 
+    @kotlin.js.JsExport public final enum class ExportedEnum : kotlin.Enum<foo.ExportedEnum>, foo.NonExportedInterface {
+        enum entry EXPORTED_ENUM_1
+
+        enum entry EXPORTED_ENUM_2
+
+        private constructor ExportedEnum()
+        public final override /*1*/ /*fake_override*/ val name: kotlin.String
+        public final override /*1*/ /*fake_override*/ val ordinal: kotlin.Int
+        protected final override /*1*/ /*fake_override*/ fun clone(): kotlin.Any
+        public final override /*1*/ /*fake_override*/ fun compareTo(/*0*/ other: foo.ExportedEnum): kotlin.Int
+        public final override /*2*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+        public final override /*2*/ /*fake_override*/ fun hashCode(): kotlin.Int
+        public open override /*2*/ /*fake_override*/ fun toString(): kotlin.String
+
+        // Static members
+        public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): foo.ExportedEnum
+        public final /*synthesized*/ fun values(): kotlin.Array<foo.ExportedEnum>
+    }
+
     @kotlin.js.JsExport public open class ExportedGenericClass</*0*/ T> {
         public constructor ExportedGenericClass</*0*/ T>()
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean