Add 'Restart Windows Explorer' command, implemented using Restart Manager (#39258)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
- Adds a new **"Restart Windows Explorer"** command to the **"Windows
System Commands"** provider
- Implemented using **Restart Manager** to allow restoring previously
opened Explorer windows after restart
- This depends on the *"Restore previous folder windows at logon"*
option in File Explorer Options
- An explicit timeout was added for terminating processes, since Restart
Manager uses very long timeouts 😴
- The shell process name (`explorer`) is hardcoded  
- The command attempts to terminate all `explorer` processes
indiscriminately
- Execution requires confirmation (if enabled in settings)


![image](https://github.com/user-attachments/assets/a9a955d5-a52b-4a57-bcb1-85293362c17a)


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## PR Checklist

- [ ] **Closes:** #39213 
- [ ] **Communication:** I've discussed this with core contributors
already. If 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
- [ ] [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

<!-- Provide a more detailed description of the PR, other things fixed
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

.github/actions/spell-check/expect.txt

@@ -1716,6 +1716,7 @@ trx
 tsa
 TSender
 TServer
+tskill
 tstoi
 TStr
 tweakme

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.System/Helpers/Commands.cs

@@ -110,6 +110,13 @@ internal static class Commands
                 });
         }
 
+        results.Add(new ListItem(new ExecuteCommandConfirmation(Resources.Microsoft_plugin_sys_RestartShell_name!, confirmCommands, Resources.Microsoft_plugin_sys_RestartShell_confirmation!, static () => OpenInShellHelper.OpenInShell("cmd", "/C tskill explorer && start explorer", runWithHiddenWindow: true)))
+        {
+            Title = Resources.Microsoft_plugin_sys_RestartShell!,
+            Subtitle = Resources.Microsoft_plugin_sys_RestartShell_description!,
+            Icon = Icons.RestartShellIcon,
+        });
+
         // UEFI command/result. It is only available on systems booted in UEFI mode.
         if (isUefi)
         {

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.System/Helpers/Icons.cs

@@ -20,6 +20,8 @@ public static partial class Icons
 
     public static IconInfo RestartIcon { get; } = new IconInfo("\uE777");
 
+    public static IconInfo RestartShellIcon { get; } = new IconInfo("\uEC50");
+
     public static IconInfo ShutdownIcon { get; } = new IconInfo("\uE7E8");
 
     public static IconInfo SleepIcon { get; } = new IconInfo("\uE708");

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.System/Properties/Resources.Designer.cs

@@ -645,6 +645,42 @@ namespace Microsoft.CmdPal.Ext.System {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Restart Windows Explorer.
+        /// </summary>
+        public static string Microsoft_plugin_sys_RestartShell {
+            get {
+                return ResourceManager.GetString("Microsoft_plugin_sys_RestartShell", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to You are about to restart Windows Explorer, are you sure?.
+        /// </summary>
+        public static string Microsoft_plugin_sys_RestartShell_confirmation {
+            get {
+                return ResourceManager.GetString("Microsoft_plugin_sys_RestartShell_confirmation", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to End and restart the Windows Explorer shell process.
+        /// </summary>
+        public static string Microsoft_plugin_sys_RestartShell_description {
+            get {
+                return ResourceManager.GetString("Microsoft_plugin_sys_RestartShell_description", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Restart.
+        /// </summary>
+        public static string Microsoft_plugin_sys_RestartShell_name {
+            get {
+                return ResourceManager.GetString("Microsoft_plugin_sys_RestartShell_name", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to ip; mac; address.
         /// </summary>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.System/Properties/Resources.resx

@@ -417,4 +417,16 @@
   <data name="Microsoft_plugin_ext_fallback_display_title" xml:space="preserve">
     <value>Open System Command</value>
   </data>
+  <data name="Microsoft_plugin_sys_RestartShell" xml:space="preserve">
+    <value>Restart Windows Explorer</value>
+  </data>
+  <data name="Microsoft_plugin_sys_RestartShell_description" xml:space="preserve">
+    <value>End and restart the Windows Explorer shell process</value>
+  </data>
+  <data name="Microsoft_plugin_sys_RestartShell_name" xml:space="preserve">
+    <value>Restart</value>
+  </data>
+  <data name="Microsoft_plugin_sys_RestartShell_confirmation" xml:space="preserve">
+    <value>You are about to restart Windows Explorer, are you sure?</value>
+  </data>
 </root>