Fix WinuiEx crash issue (#45443)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
Fixes a crash related to `IsShownInSwitchers` when explorer.exe is not
running. The property has been removed from XAML and is now set in the
C# backend with added exception handling to improve stability. No
changes were made for projects where the property is set to true, as
they are not affected.

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

- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **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

---------

Co-authored-by: vanzue <vanzue@outlook.com>

Author: shuaiyuanxx

src/modules/MeasureTool/MeasureToolUI/MeasureToolXAML/MainWindow.xaml

@@ -10,7 +10,6 @@
     IsMaximizable="False"
     IsMinimizable="False"
     IsResizable="False"
-    IsShownInSwitchers="False"
     IsTitleBarVisible="False"
     mc:Ignorable="d">
     <winuiex:WindowEx.Backdrop>

src/modules/MeasureTool/MeasureToolUI/MeasureToolXAML/MainWindow.xaml.cs

@@ -52,12 +52,23 @@ public MainWindow(PowerToys.MeasureToolCore.Core core)
             var presenter = _appWindow.Presenter as OverlappedPresenter;
             presenter.IsAlwaysOnTop = true;
             this.SetIsAlwaysOnTop(true);
-            this.SetIsShownInSwitchers(false);
             this.SetIsResizable(false);
             this.SetIsMinimizable(false);
             this.SetIsMaximizable(false);
             IsTitleBarVisible = false;
 
+            try
+            {
+                this.SetIsShownInSwitchers(false);
+            }
+            catch (NotImplementedException)
+            {
+                // WinUI will throw if explorer is not running, safely ignore
+            }
+            catch (Exception)
+            {
+            }
+
             // Remove the caption style from the window style. Windows App SDK 1.6 added it, which made the title bar and borders appear for Measure Tool. This code removes it.
             var windowStyle = GetWindowLong(hwnd, GWL_STYLE);
             windowStyle = windowStyle & (~WS_CAPTION);

src/settings-ui/QuickAccess.UI/QuickAccessXAML/MainWindow.xaml

@@ -15,7 +15,6 @@
     IsMaximizable="False"
     IsMinimizable="False"
     IsResizable="False"
-    IsShownInSwitchers="False"
     IsTitleBarVisible="False"
     mc:Ignorable="d">
     <winuiEx:WindowEx.Backdrop>

src/settings-ui/QuickAccess.UI/QuickAccessXAML/MainWindow.xaml.cs

@@ -305,7 +305,17 @@ private void HideFromTaskbar()
             return;
         }
 
-        _appWindow.IsShownInSwitchers = false;
+        try
+        {
+            _appWindow.IsShownInSwitchers = false;
+        }
+        catch (NotImplementedException)
+        {
+            // WinUI Will throw if explorer is not running, safely ignore
+        }
+        catch (Exception)
+        {
+        }
     }
 
     private bool CloakWindow()