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

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

src/modules/cmdpal/Tests/Microsoft.CmdPal.Ext.System.UnitTests/QueryTests.cs

@@ -142,11 +142,7 @@ public class QueryTests : CommandPaletteUnitTestBase
         // UEFI Firmware Settings command should exist
         Assert.IsNotNull(result);
         var firstItem = result.FirstOrDefault();
-        Assert.IsNotNull(firstItem, "No items matched the query.");
-        var containsFirmwareSettings = firstItem.Title.Contains("UEFI Firmware Settings", StringComparison.OrdinalIgnoreCase);
-
-        Assert.IsTrue(
-            containsFirmwareSettings == hasCommand,
-            $"Expected to match 'UEFI Firmware Settings' but got '{firstItem.Title}'");
+        var firstItemIsUefiCommand = firstItem?.Title.Contains("UEFI", StringComparison.OrdinalIgnoreCase) ?? false;
+        Assert.AreEqual(hasCommand, firstItemIsUefiCommand, $"Expected to match (or not match) 'UEFI Firmware Settings' but got '{firstItem?.Title}'");
     }
 }