[test262] Add new staging test for RegExp named groups

This CL adds a staging test for testing test262 bot.

Bug: v8:13173
Change-Id: I7f3d3aa3fbcf30b08cf3ebf2c61a683b7d2cf7c6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/5281634
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Liviu Rau <liviurau@google.com>
Cr-Commit-Position: refs/heads/main@{#92345}

test/staging/built-ins/RegExp/named-groups/duplicate-named-groups.js

@@ -0,0 +1,16 @@
+// Copyright (C) 2024 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Test different functions with duplicate names in alteration.
+features: [regexp-duplicate-named-groups]
+includes: [compareArray.js]
+---*/
+
+assert.compareArray(
+    ['xxyy', undefined, 'y'], /(?:(?:(?<a>x)|(?<a>y))\k<a>){2}/.exec('xxyy'));
+assert.compareArray(
+    ['zzyyxx', 'x', undefined, undefined, undefined, undefined],
+    /(?:(?:(?<a>x)|(?<a>y)|(a)|(?<b>b)|(?<a>z))\k<a>){3}/.exec('xzzyyxxy'));
+assert.compareArray(
+    ['xxyy', undefined, 'y'], 'xxyy'.match(/(?:(?:(?<a>x)|(?<a>y))\k<a>){2}/));