Add telemetry for shortcut conflict detection feature. (#41271)

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fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
Add telemetry for shortcut conflict detection.

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## PR Checklist

- [ ] Closes: #xxx
- [ ] **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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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

---------

Signed-off-by: Shawn Yuan <shuaiyuan@microsoft.com>
Signed-off-by: Shuai Yuan <shuai.yuan.zju@gmail.com>

src/settings-ui/Settings.UI/ViewModels/MouseWithoutBordersViewModel.cs

@@ -29,7 +29,7 @@ using Windows.ApplicationModel.DataTransfer;
 
 namespace Microsoft.PowerToys.Settings.UI.ViewModels
 {
-    public partial class MouseWithoutBordersViewModel : PageViewModelBase, IDisposable
+    public partial class MouseWithoutBordersViewModel : PageViewModelBase
     {
         protected override string ModuleName => MouseWithoutBordersSettings.ModuleName;
 
@@ -43,6 +43,8 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
         private readonly Lock _machineMatrixStringLock = new();
 
+        private bool _disposed;
+
         private static readonly Dictionary<SocketStatus, Brush> StatusColors = new Dictionary<SocketStatus, Brush>()
         {
             { SocketStatus.NA, new SolidColorBrush(ColorHelper.FromArgb(0, 0x71, 0x71, 0x71)) },
@@ -1262,38 +1264,43 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
         protected override void Dispose(bool disposing)
         {
-            if (disposing)
+            if (!_disposed)
             {
-                // Cancel the cancellation token source
-                _cancellationTokenSource?.Cancel();
-                _cancellationTokenSource?.Dispose();
+                if (disposing)
+                {
+                    // Cancel the cancellation token source
+                    _cancellationTokenSource?.Cancel();
+                    _cancellationTokenSource?.Dispose();
 
-                // Wait for the machine polling task to complete
-                try
-                {
-                    _machinePollingThreadTask?.Wait(TimeSpan.FromSeconds(1));
-                }
-                catch (AggregateException)
-                {
-                    // Task was cancelled, which is expected
+                    // Wait for the machine polling task to complete
+                    try
+                    {
+                        _machinePollingThreadTask?.Wait(TimeSpan.FromSeconds(1));
+                    }
+                    catch (AggregateException)
+                    {
+                        // Task was cancelled, which is expected
+                    }
+
+                    // Dispose the named pipe stream
+                    try
+                    {
+                        syncHelperStream?.Dispose();
+                    }
+                    catch (Exception ex)
+                    {
+                        Logger.LogError($"Error disposing sync helper stream: {ex}");
+                    }
+                    finally
+                    {
+                        syncHelperStream = null;
+                    }
+
+                    // Dispose the semaphore
+                    _ipcSemaphore?.Dispose();
                 }
 
-                // Dispose the named pipe stream
-                try
-                {
-                    syncHelperStream?.Dispose();
-                }
-                catch (Exception ex)
-                {
-                    Logger.LogError($"Error disposing sync helper stream: {ex}");
-                }
-                finally
-                {
-                    syncHelperStream = null;
-                }
-
-                // Dispose the semaphore
-                _ipcSemaphore?.Dispose();
+                _disposed = true;
             }
 
             base.Dispose(disposing);