Always on top: window context menu to always on top (#45773)

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## Summary of the Pull Request

Add an option to enable inject a window context menu to always on top
this window.

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## PR Checklist

- [ ] Closes: #45638 #15387
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- [ ] **Communication:** I've discussed this with core contributors
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- [ ] **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)
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- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
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pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
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and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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https://github.com/user-attachments/assets/37eb3f74-1ccc-42f2-83c3-1100f55765ee

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Co-authored-by: Niels Laute <niels.laute@live.nl>

src/settings-ui/Settings.UI.UnitTests/Cmd/SetSettingCommandTests.cs

@@ -43,6 +43,7 @@ public class SetSettingCommandTests
     [DataRow(typeof(FancyZonesSettings), nameof(FZConfigProperties.FancyzonesBorderColor), "#00FF00")]
     [DataRow(typeof(MeasureToolSettings), nameof(MeasureToolProperties.ActivationShortcut), "Ctrl+Alt+Delete")]
     [DataRow(typeof(AlwaysOnTopSettings), nameof(AlwaysOnTopProperties.SoundEnabled), "False")]
+    [DataRow(typeof(AlwaysOnTopSettings), nameof(AlwaysOnTopProperties.ShowInSystemMenu), "true")]
     [DataRow(typeof(PowerAccentSettings), nameof(PowerAccentProperties.ShowUnicodeDescription), "true")]
     [DataRow(typeof(AwakeSettings), nameof(AwakeProperties.Mode), "EXPIRABLE")]
     [DataRow(typeof(AwakeSettings), nameof(AwakeProperties.ExpirationDateTime), "March 31, 2020 15:00 +00:00")]