CmdPal: Add option to Clipboard History extension to keep item after pasting (#41444)

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## Summary of the Pull Request

This PR introduces a new toggle in the Clipboard History extension
settings that allows items to remain in history after being pasted into
another application.

It also adds a separate menu item to remove items from history manually.
Item deletion is protected by a confirmation prompt, which can be
disabled in the settings.

Additionally, it introduces a shared `ConfirmableCommand` that can wrap
any command with a confirmation prompt.

Pictures? Pictures!

<img width="1541" height="981" alt="image"
src="https://github.com/user-attachments/assets/ed046f6e-f2dd-494c-b393-36add6b77346"
/>

<img width="1482" height="930" alt="image"
src="https://github.com/user-attachments/assets/fea89e55-ade0-4b6d-8fe2-d9a2b861bb49"
/>

<img width="1526" height="948" alt="image"
src="https://github.com/user-attachments/assets/a1041ce8-ae44-4b1f-8ed4-ec464580092a"
/>



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## PR Checklist

- [x] Closes: #41433
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **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
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pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
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- [ ] **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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## Validation Steps Performed

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.ClipboardHistory/KeyChords.cs

@@ -0,0 +1,19 @@
+// 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.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.CommandPalette.Extensions;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+using Windows.System;
+
+namespace Microsoft.CmdPal.Ext.ClipboardHistory;
+
+internal static class KeyChords
+{
+    internal static KeyChord DeleteEntry { get; } = KeyChordHelpers.FromModifiers(ctrl: true, shift: true, vkey: VirtualKey.Delete);
+}