[CmdPal] Eliminate CopyTextCommand duplicates (#41347)

## Summary of the Pull Request
Removes redundant CopyCommands and replaces their usage with
`CopyTextCommand` from the toolkit. This is actually recommend by the
[docs](https://learn.microsoft.com/en-us/windows/powertoys/command-palette/command-results#showtoast-command-result),
we should probably lead by example 😄
> Consider the CopyTextCommand in the helpers - this command will show a
toast with the text "Copied to clipboard", then dismiss the palette.

Only functionality change is that they now display *Copied to
clipboard!* after copying.
## PR Checklist

- [x] Closes: #41346
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** All pass
- [x] **Localization:** All end-user-facing strings can be localized
- [x] **Dev docs:** No need
- [x] **New binaries:** None
- [x] **Documentation updated:** No need
## Detailed Description of the Pull Request / Additional comments
Custom command names (e.g. *Copy path* instead of *Copy*) are preserved.
Strings put out of use have been deleted.
CopyCommands from the Registry and Clipboard plugins are left untouched,
as they contain special logic.
The error handling in `CopyPathCommand` from Apps was unnecessary, since
it's already taken care of by `ClipboardHelper`.
## Validation Steps Performed
Manual testing

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WindowsSettings/Commands/CopySettingCommand.cs

@@ -1,39 +0,0 @@
-// 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.Diagnostics;
-using System.Linq;
-using System.Resources;
-using System.Text;
-using System.Threading.Tasks;
-using Microsoft.CmdPal.Ext.WindowsSettings.Classes;
-using Microsoft.CmdPal.Ext.WindowsSettings.Properties;
-using Microsoft.CommandPalette.Extensions;
-using Microsoft.CommandPalette.Extensions.Toolkit;
-using Windows.ApplicationModel.DataTransfer;
-using Windows.Networking.NetworkOperators;
-using Windows.UI;
-
-namespace Microsoft.CmdPal.Ext.WindowsSettings.Commands;
-
-internal sealed partial class CopySettingCommand : InvokableCommand
-{
-    private readonly WindowsSetting _entry;
-
-    internal CopySettingCommand(WindowsSetting entry)
-    {
-        Name = Resources.CopyCommand;
-        Icon = Icons.CopyIcon;
-        _entry = entry;
-    }
-
-    public override CommandResult Invoke()
-    {
-        ClipboardHelper.SetText(_entry.Command);
-
-        return CommandResult.Dismiss();
-    }
-}

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WindowsSettings/Helpers/ContextMenuHelper.cs

@@ -23,7 +23,7 @@ internal static class ContextMenuHelper
     {
         var list = new List<CommandContextItem>(1)
         {
-            new(new CopySettingCommand(entry)),
+            new(new CopyTextCommand(entry.Command) { Name = Resources.CopyCommand }),
         };
 
         return list;