[cmdpal] Fix TimeAndDate extension crash issue when typing query (#40245)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request
When we call RaiseItemsChanged, it will trigger function GetItems. So if
you enter this function through typing query, it will trap in an inf
loop. Eventually leading to crash.

related change: https://github.com/microsoft/PowerToys/pull/40050

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## PR Checklist

- [x] **Closes:** #39973
- [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
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for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
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on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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Co-authored-by: Yu Leng <yuleng@microsoft.com>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.TimeDate/Pages/TimeDateExtensionPage.cs

@@ -17,6 +17,7 @@ internal sealed partial class TimeDateExtensionPage : DynamicListPage
     private readonly Lock _resultsLock = new();
 
     private IList<ListItem> _results = new List<ListItem>();
+    private bool _dataLoaded;
 
     private SettingsManager _settingsManager;
 
@@ -33,11 +34,23 @@ internal sealed partial class TimeDateExtensionPage : DynamicListPage
 
     public override IListItem[] GetItems()
     {
+        ListItem[] results;
+        lock (_resultsLock)
+        {
+            if (_dataLoaded)
+            {
+                results = _results.ToArray();
+                _dataLoaded = false;
+                return results;
+            }
+        }
+
         DoExecuteSearch(string.Empty);
 
         lock (_resultsLock)
         {
-            ListItem[] results = _results.ToArray();
+            results = _results.ToArray();
+            _dataLoaded = false;
             return results;
         }
     }
@@ -75,6 +88,7 @@ internal sealed partial class TimeDateExtensionPage : DynamicListPage
         lock (_resultsLock)
         {
             this._results = result;
+            _dataLoaded = true;
         }
 
         RaiseItemsChanged(this._results.Count);