move Automation Notification functionality to UIHelper, implement UIHelper in ListPage and SettingsWindow (#41016)

## Summary of the Pull Request
Fixed #41014 and it overlapped with #40761, so I made a UIHelper
patterning off of WinUI Gallery's
[UIHelpder](0576fb508a/WinUIGallery/Helpers/UIHelper.cs (L63))

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## PR Checklist

- [x] Closes: #41014
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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https://github.com/user-attachments/assets/011ee8c1-baaf-47fc-b8f8-ee489b01702b

src/modules/cmdpal/Microsoft.CmdPal.UI/Helpers/UIHelper.cs

@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Automation.Peers;
+
+namespace Microsoft.CmdPal.UI.Helpers;
+
+public static partial class UIHelper
+{
+    static UIHelper()
+    {
+    }
+
+    public static void AnnounceActionForAccessibility(UIElement ue, string announcement, string activityID)
+    {
+        if (FrameworkElementAutomationPeer.FromElement(ue) is AutomationPeer peer)
+        {
+            peer.RaiseNotificationEvent(
+                AutomationNotificationKind.ActionCompleted,
+                AutomationNotificationProcessing.ImportantMostRecent,
+                announcement,
+                activityID);
+        }
+    }
+}