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))

<!-- Please review the items on the PR checklist before submitting-->
## 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

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed



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

src/modules/cmdpal/Microsoft.CmdPal.UI/ExtViews/ListPage.xaml.cs

@@ -7,6 +7,7 @@ using CommunityToolkit.Mvvm.Messaging;
 using ManagedCommon;
 using Microsoft.CmdPal.Core.ViewModels;
 using Microsoft.CmdPal.Core.ViewModels.Messages;
+using Microsoft.CmdPal.UI.Helpers;
 using Microsoft.CmdPal.UI.Messages;
 using Microsoft.CmdPal.UI.ViewModels;
 using Microsoft.Extensions.DependencyInjection;
@@ -162,11 +163,11 @@ public sealed partial class ListPage : Page,
             if (listViewPeer is not null && li is not null)
             {
                 var notificationText = li.Title;
-                listViewPeer.RaiseNotificationEvent(
-                    Microsoft.UI.Xaml.Automation.Peers.AutomationNotificationKind.Other,
-                    Microsoft.UI.Xaml.Automation.Peers.AutomationNotificationProcessing.MostRecent,
-                    notificationText,
-                    "CommandPaletteSelectedItemChanged");
+
+                UIHelper.AnnounceActionForAccessibility(
+                     ItemsList,
+                     notificationText,
+                     "CommandPaletteSelectedItemChanged");
             }
         }
     }