[JS IR] Override method are not exported

[JS IR] Add test with jsexport overrides not js export method with stable name

^KT-44616 fixed

js/js.translator/testData/box/export/overriddenExternalMethodWithSameStableNameMethod.kt

@@ -0,0 +1,41 @@
+// IGNORE_BACKEND: JS
+// RUN_PLAIN_BOX_FUNCTION
+// INFER_MAIN_MODULE
+
+// MODULE: overriden-external-method-with-same-stable-name-method
+// FILE: lib.kt
+external abstract class Foo {
+    abstract fun o(): String
+}
+
+abstract class Bar : Foo() {
+    @JsName("oStable")
+    abstract fun String.o(): String
+
+    override fun o(): String {
+        return "O".o()
+    }
+}
+
+@JsExport
+class Baz : Bar() {
+    override fun String.o(): String {
+        return this
+    }
+}
+
+// FILE: test.js
+function Foo() {}
+Foo.prototype.k = function() {
+    return "K"
+}
+
+function box() {
+    return test(new this["overriden-external-method-with-same-stable-name-method"].Baz());
+}
+
+function test(foo) {
+    const oStable = foo.oStable("OK")
+    if (oStable !== "OK") return "false: " + oStable
+    return foo.o() + foo.k()
+}