[CmdPal][UT] Refactor some cmdpal ext's ut and improve the test case (#40896)

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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
1. Remove some AI generated nonsense case
2. Add ISettingsInterface for those ext for testing purpose.
3. Add query test.

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## PR Checklist

- [x] Closes: #40897
- [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

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## Detailed Description of the Pull Request / Additional comments

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---------

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

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WindowWalker/Helpers/ISettingsInterface.cs

@@ -0,0 +1,26 @@
+// 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.
+
+namespace Microsoft.CmdPal.Ext.WindowWalker.Helpers;
+
+public interface ISettingsInterface
+{
+    public bool ResultsFromVisibleDesktopOnly { get; }
+
+    public bool SubtitleShowPid { get; }
+
+    public bool SubtitleShowDesktopName { get; }
+
+    public bool ConfirmKillProcess { get; }
+
+    public bool KillProcessTree { get; }
+
+    public bool OpenAfterKillAndClose { get; }
+
+    public bool HideKillProcessOnElevatedProcesses { get; }
+
+    public bool HideExplorerSettingInfo { get; }
+
+    public bool InMruOrder { get; }
+}

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WindowWalker/Helpers/SettingsManager.cs

@@ -8,7 +8,7 @@ using Microsoft.CommandPalette.Extensions.Toolkit;
 
 namespace Microsoft.CmdPal.Ext.WindowWalker.Helpers;
 
-public class SettingsManager : JsonSettingsManager
+public class SettingsManager : JsonSettingsManager, ISettingsInterface
 {
     private static readonly string _namespace = "windowWalker";